What's in the box and what it fits
This is a full kingpin rebuild kit — pins, bushings, thrust bearings, seals, the works — sized for the EFA12F3 and EFA13F3 knuckle housings. Those axles show up on MAN trucks built off Rockwell front axle architecture, most commonly paired with the V8 65C-02, and MAN's used that combo across a long production run, 1993 clear up through current builds.
If your steering's got slop in it, the truck wanders under braking, or you're hearing that clunk over bumps that everybody blames on the shocks first — kingpins are usually the real culprit. This kit replaces the wear parts so the knuckle pivots the way it's supposed to instead of flopping around on worn bushings.
Why all these numbers cross to the same kit
HKP2335 and 262-1586 are aftermarket house numbers from different suppliers packaging the same kit dimensions. EFA12F3 and EFA13F3 are the Eaton axle model designations this kit is machined to fit — that's the housing family, not a brand-specific part number, which is why one kit covers both. 70.121.05 and 50.121.05 are the MAN parts-book numbers you'll find in the dealer catalog for the same application.
All of that lines up to K121E because the pin diameter, bushing bore, and thrust bearing stack are identical across these listings. Where it can bite you is arm length and seal ID — MAN ran a couple different steering arm configurations depending on year and trim, and seal sizing can shift if a previous owner swapped a knuckle from a different build. Pull the old kingpin or check the axle tag before you order, don't just go by truck year.
Ordering from PartStop
We stock this in Tacoma and if you're local, most orders go out same-day — good if you've got a truck sitting on jack stands and a driver waiting. Ship nationwide too, so it doesn't matter if you're calling from Spokane or Sioux Falls.
Comes with our standard 6+ month warranty. This is a direct replacement for the EFA12F3/EFA13F3 kingpin kit, not a guess — but confirm the number off your old kit or your VIN before you check out. Front axle kingpin work is not the place to find out you ordered wrong.
K121E Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to K121E. 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 |
|---|---|
| Cross-Reference | HKP2335, 262-1586, EFA12F3, EFA13F3, 70.121.05, 50.121.05, M-2383 |
Frequently asked questions
Does K121E fit my 2011 MAN with Rockwell front axle?
Likely yes if it's running the EFA12F3 or EFA13F3 housing with the V8 65C-02, which covers a big chunk of that production run. Check the axle tag or the number stamped on your old kingpin to be sure before ordering — MAN mixed a few configurations over the years.
Is this the same as the 262-1586 kit?
Same kit, different house number. 262-1586 is another supplier's part number for the identical EFA12F3/EFA13F3 kingpin kit — pin size, bushings, and seals all cross. Doesn't hurt to match it against your old part before you commit.
What's actually included in the kingpin kit?
Kingpins, bushings, thrust bearings, and seals for one side of the axle — check the listing for whether it's a single-side or full front axle kit before ordering, since some shops need two kits to do the whole front end.
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.