200s vs 185 tank size

[Tucker11]

I'm looking for a new tank for my 1984 200s on Ebay. The adds say will fit either a 185 or a 200. I looked at (bikebandit.com) and 185s and 200s tanks have different part numbers. Anyone know why?

[Mud1m]

just because they are different machines. they are identical though

[AutoXer]

its probably my tank you are looking at