If you need the parts Dusty listed for the 510/520 Shaper Fence they are common hardware parts and should be able to be found locally and cheaper.
If you need the parts for the 500 Shaper Fence they are
Clamp P/N 5130789 $13.64 (not sure if this is each or a pair so a call to Shopsmith would needed)
Clamp Screw P/N 426370 $3.95 each
Washer P/N 120394 $3.95 each
The Clamp screw is an Allen Wrench Cap Screw and a plain washer. I recommend getting the Clamps and buying the washers and cap screws locally. Shopsmith's minimum price for parts is $3.95 to help cover their costs of getting, stocking and handling of parts.
Sorry I do not know the size of the washer and cap screw but if needed I can get it. My 500 Shaper fence is stored. I believe they are 3/8"-16 since the washers are the same for the 500 and 510/520.
Mark V 520 S/N 09-11-01 completely upgraded to Mark 7, with all SPT's & more.
Model 10ER S/N R64000 first one I restored on bench w/ Shopsmith metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E S/N 1077 oldest one I have restored. On bench w/ Shopsmith metal ends & retractable casters.