the SR is the european model with metal tank,smaller carb & oil injection pump?? we didnt have many of these here in the UK or many of the similar 200 `enduro` models of around that year come to think of it, you may find parts over here a little difficult to source for both models as they dont come up that often if ever..we seemed to get the early 80`s 175/200 twin shock/early mono kdx`s then things kinda went dry for a bit, they then re-appeared again in the mid to late 90`s & so on through to the later 200/220s (220`s more than the 200`s for some reason)..try crealy kawasaki or corby kawasaki for parts, they maybe able to help