Two FLM Savage Ext arm kits. whats' the difference?

[Finnster]

Well I converted my Sav XL, didn't have a flux, so I already had the longer length. Def worth having.

The arm sets are important as it includes a custom ext dogbone, which needs to fit the drive cups also. It is frustrating the lack of detail and desc on some of the FLM stuff. Feels like the puzzles my kids have in their books where you are trying to spot the differences, but there are no answers in the back. lol

I got the FLM bulks too (for the XL fortunately) and will be changing to the HPI BP diff set from the Cen diffs I have know as I blew another pinion gear. I like the Cen internals better, but the R&P are made of cheap cast metal and tend to break far easier than they should. The solid bulk case and hardened BP diff should make a very sturdy gearset.
I hope so at least as I don't want to be opening up these diffs often!