I have some rollers in good condition, shoot me a PM - not in CA tho...
you might try F.P. Smith in California
you can try you local ITR stockist they do have some d4 stuff. the dealers also still have some parts to rebuild track gear
Chance Price Empire ca. Has under carriage parts and does track rebuilds, Chance is 3rd generation in the track and undercarriage business nice guy nice to do business with. 17afarmer