I believe the stomp starter linkage is the same thru the 47-55.1 trucks and likely later as some later trucks use stomp starters.
As far as the blank line in the parts listing, that just means that line and the next one down to the PN are the same, so the PN for that line you highlighted is 371704.
Your best bet would be to post an ad in the Swap Meet. I might even have some of those linkage parts in my pile of stuff. I'd have to look.
