Ahhh, I see! The look pattern is three bolts, but the the paired bolts are wider than the spd pattern on the ones I have..........
Ye should indeed be able to bodge up a set- metal baseplate bent to form the flange/slot bit and hardwood for the 'ramp'. I bet Old Stylee roadies made them like that in days of yore!
_________________Yer Power b'roight Weak, Old Maan- Oi'll tek yon Loightzaber an' Stick it Up Thy Bum!
If only they had let Dave Prowse do the voice.......
...............buy my old tat!!