Old age and memory do me no favours here .... but I seem to remember that the wheel I used was from a CR250. probably a 78 or 79 model. Think it was a straight swop too.
There are others here that will have done it, and remembered what they did. Me .... I had good results on the old twinshock XR, but hankered after something faster. The CR250 in enduro mode was a disaster. The old KLX250 from 81 was a winner. Gutless but good.