Schumacher MMS & alloy diff pulleys

[ben77]

Hi all, im a new member thats been away from the RC scene for nearly 20 years, so im a bit out of touch. About a week back i dug out my old box of mostly Cougar parts and amongst these parts ive got a few bits from an old Pro-Cat i once owned and would appreciate if somebody can identify them for me please.
First up are these, i think MMS diffs that are little used, if used at all. i originally thought they were both for a 4wd, but now im not sure if ive got a front 4wd diff pulley or one for a 2wd? It measures 12mm wide to the outside edges.


And secondly this alloy diff pulley, does anyone have any info about this also?



Thanx in advance, Ben