I saved this info from a post a few years ago. Your
traveler car looks like mine and I was able to find
new rollers (bearings) online from a RWO dealer.

Looks like your traveler car is a RWO Part # R343. These
cars were commonly used on Tornados in the late seventies
and eighties. Replacement rollers are available from RWO
(Marine Equipment) Limited, Church Road, Benfleet Essex UK
SS7 4QW phone(03745) 52821. The new rollers are a press fit
over the punch marks at the ends of the spindles