Anybody know where to get a slipper clutch for JRX-pro?

[CODMAN]

Hi all, I used to race in the late 80s, early 90s and am just recently re-taking an interest in RC cars. I pulled out my old JRX-pro and Yokomo C4 (YZ10) and they are still running great! Even my 1200 mah SCR batteries are still good (I was kinda amazed!!!!).

Anyways, for now I'm just playing around with the gear I have and might try a race sometime (if I can get myself some NiMH batteries). But to race 2wd open around where I live, I'm going to need a beefier motor (used to race stock) and my JRX-pro doesn't have a slipper clutch. Would anybody have any idea where I could get my hands on one that would fit? I believe RPS used to make one. Either new or used would be OK for me...

Thanks for your help!

Simon