These forks were on the RMS which are 35mm I dismantled them for parts to rebuild the originals, I still have tubes ,rods and bodies the seal area has good chrome but between the clamps has a fair bit of rust.
I think they are SP or DR forks, the caps are internal socket type I could have compared them to my RL ones for you when I had mine stripped down a few months back
. Let me know if you need more info like measurements
Nob