Fitment – Oil bath dust caps fits for 9k-10K General Duty Axles Built After 1989 & Before July 2009, fits for 10K HD, 12K, & 15K Axles.
Replace Number – This oil caps replace number is K71-148-00.
High Quality Materials – This oil caps made of high-quality durable material, it is corrosion-resistant, oxidation-resistant, does not fade and rust, and has a long service life.
Easy to install – Easy installation, only need to tighten the thread during installation, no need to drill. Or you can install it after watching the Youtube video.
Package Include – This oil bath dust cap kit including O-Rings- 010-050-00 , Oil Caps – 021-036-00, Plugs – 046-032-00. Outside Diameter – 4″ . Product Description
Fitment-
Fits for 9k-10K General Duty Axles Built After 1989 & Before July 2009
Fits for 10K HD, 12K, & 15K Axles
Product Feature –
1.Outside Thread Diameter: 4″-12
2.Plastic Cap is Marked 21-36 on the Outside
3.This Kit Includes 2 Screw-on Oil Caps, 2 O-Rings, 2 Rubber Plugs (46-32)
4.Cross Reference:: 2136, 21-36, K7114800, K71-148-00
5.Fitment Type: Direct Replacement
Installation – 
Easy to install, you can install it directly.
Package Include-
2x Caps 21-36
2x O-rings
2x Rubber plugs