Goob,
I got my pins for my '50 5700 at Spectrac (spectrac.com) in Mesa/Gilbert, AZ. That was 4 or 5 years ago, so I don't know if they can still help you.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix