I have a 1955 (1st series) 3100 pickup. I am having a difficult time trying to find the brass distribution block that fits on the rear of the master cylinder. It is a small rectangular block with approximately a 5/8" hole for a banjo bolt and a 3/16" brake hole that takes the flared end of a 3/16" brake line. Chevs of the 40s has one, but the hole is too small 3/8 versus 5/8. part # is 3696540 if that will help with the description. Can anyone help me locate this part? Thank you!