I don't know if any one else has seen these current postings up on eBay nor do I know if the guy selling these is a member of this forum but $9.50 for a pair of replacement end caps and $35.00 for a replacement handle seems a bit steep to me.
If anybody out there is in need of these parts for a restoration project contact the American Handle Company. They manufacture both the vintage style handles and the handle end caps. I was able to get a set of 10 end caps for my full stack from them for a heck of alot less than $9.50 a pair.