ARC/ARM suspension

[DAGE]

I've been doing some research and it seems like in 98 Ski-Doo put a AD Boivin suspension in the Formula 670's, it's supposed to be a copy of the expert x, I was thinking of buying a 95 Forumula SS which is supposed to have an AD Boivin suspension, how do I know if it's the ARC/ARM suspension or the expert x, or is there a difference between the two, here's some pics

 

[KevinS]

Looks like the ARM skid.

Not my sled. Just some pictures I found online.

 

[DAGE]

hmmmm definately looks like it's the ARC/ARM suspension on the 95, I figured it was the one since I didn't think someone would change all the bogies to the DOO ones

anyone know what the differences are between this skid and an expert X