Finally fitted my set from Maverick in preparation for next weekend's concours.
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Sorry you'll have to look sideways on this photo.
The process did involve re-aligning the holes in the brake pedal and top one of the accelerator, as the holes were spaced for 4200 which is slightly different than GS.
Nevertheless great result.
I re-used 2 allen bolts from the accelerator to mount the footrest. You'll find there are 6 plugs locating the rubber, just lever them out.
I drilled out the lower left and created a new hole in the middle so the allen bolts could screw in firmly. I think it was a 5/16" drill bit.
I also re-painted the black surface before attaching the pedals as you never know how fussy these concours judges will be.