For sale I have a barnd new gold rear Sun rim. 36 hole 18 x 2.15. It was drilled by Buchanans in USA probably 10 years ago. Never been laced to hub. Been sitting in box.
it will fit all 76-80 RM 250, 370, 400. All 77-82 PE250 & 400. 1980 DR400, 81-84 DR & SP500 and 80-81 RS250
Basically it will fit any rear hub that has equal size diameter flanges and the rim is centered between the left and right flanges.
It probably fits other Honda, Yamaha and Kawasaki hubs if they meet same conditions above but i have not had time to research through my Sun catalogues yet.
Can supply photos.
$200 AUD or will consider swap for TS185/250 parts