What You're Actually Buying
This is a complete halogen headlight assembly - housing, lens, reflector, the works - built for the passenger side of the Vision and Pinnacle cab. Long production run on these trucks means the housing shape stayed pretty consistent, but Mack shuffled part numbers a few times over the years as suppliers changed, which is why you'll see this cross to more than one Mack number.
It's a direct replacement for a cracked lens, fogged-up reflector, or a housing that took a rock through the grille. Bulbs and sockets are separate wear items - this is the shell and optics, not a bulb kit.
Passenger side only. Don't order this thinking it's a universal left-right part - Vision and Pinnacle headlights are side-specific, and swapping one to the wrong side will leave you with a beam pattern aimed into oncoming traffic or the ditch, depending which way you got it backwards.
Why These Numbers Cross
The Mack numbers - 2MO521M, 25154252, 82359035 - are basically the same housing carried under different Mack part number revisions as their catalog system got updated over the model years. Aftermarket houses picked it up under 114-00624R and MC2503102, which are the same physical part built to the same mounting points and connector layout.
What to actually check before you order: mounting tab locations, the connector/plug style on the back (Mack changed harness connectors at least once in this run), and whether your truck has the trim ring or bezel built into the housing versus a separate piece. If your old part has a tab broken off right where it bolts to the hood latch bracket, take a photo - that's the detail that trips people up on returns.
Bulb type matters too. This is a halogen assembly - if somebody retrofitted your truck with HID or LED at some point, the housing won't be wired the same and you'll need to match what's actually in the truck now, not what left the factory.
Ordering From PartStop
We're in Tacoma and keep these in stock for same-day will-call or local delivery if you're a fleet account nearby. Ship nationwide too, usually next-day or two-day depending on where you're at - we move enough of these that they don't sit on a shelf long.
Before you check out, pull the number off your old housing or run your VIN by us. Mack build sheets aren't always consistent about which headlight generation shipped on which truck, especially in the years they were transitioning Vision to Pinnacle badging, so a VIN check saves you a return shipment.
Comes with our standard 6+ month warranty. If it shows up cracked or doesn't seat right, call the counter direct - we'd rather sort it over the phone than have you stuck with a truck half-lit.
MKN-401-R Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to MKN-401-R. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Mack | 2MO521M, 25154252, 82359035 |
| Aftermarket | 114-00624R, MC2503102 |
Frequently asked questions
Does MKN-401-R fit my 2014 Pinnacle?
Likely, but confirm with your VIN or the number stamped on your old housing - Mack changed connector styles partway through the Pinnacle run and we want to make sure your harness plug matches before it ships.
Is this the same as the Mack 25154252 headlight?
Same housing, yes - 25154252 is one of the Mack part number revisions this crosses to. Physically interchanges, but always check your old part's number against ours if you're unsure which revision your truck actually left the factory with.
Does this come with the bulb and wiring harness?
It's the complete housing assembly with reflector and lens, sockets included, but no bulb and no separate harness - those are sold separately since bulb type and harness condition vary truck to truck.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.