I have my spring and the extension bar in my pile of parts and can dig them out tomorrow also. I did take a look at the FAM but it shows the spring hooked on the gusset on that crossmember. See Section 5, Sheet 3.00. But the later trucks shown in the FAM only have a single rod between the pedal link and the cross-bar with a tab where the spring hooks on. My '51 and I believe a '50 would have a 2 piece rod where the spring hooks over the pin connecting the two rods.