Yeah I remember them now !... a friend of mine had one on a 750 he used to race back in the '70's
Can still buy a replica @ 264 quid
( U.K. pounds... about $400 ) un-painted , dang I could buy another wife for that , LOL
... dang nice tho'...... think they would only work with rearsets too, O.K. for you young fellas