Well,
I'll give the blokes at Auto-Zone a shot....
It seems that nobody lists that 7/8" WC that fits the '55-'59 1-1/2 & 2 ton trucks anymore, which is probably why Joe Way has had a batch of them come in for sleeving... but I noticed that the big trusk which used the 14" drum brakes into the '80s employ a 7/8" WC up front, so I've ordered one from a local jobber to see if it just might work.....
Will report on my findings
Frank McMullen