The Raleigh used a Sturmey Archer gearbox, similar/same as Nortons and a number of other makers used.
There were a few different models of these, what model Raleigh(s) are involved ?
Someone in the UK is making new main bearings for these, at a fair premium price, but it is a custom bearing.
Otherwise, trawling through swap meets and ebay listings may happen to produce what ye seek.
A heavyweight SA gearbox changed hands recently, somewhere about the $1200 mark, they do appear sporadically.
Contacting your local vintage club may produce some contacts, these things tend to be hoarded these days,
and are somewhat sought after.
Hopethishelps.