If you post this question over at
http://forums.peavey.com/, you should have an answer by Monday.
I think those are fairly standard parts, but I'd get the exact part number(s) from Peavey. They might even send you some to Estonia for cheap...
Peavey customer service has helped me several times on servicing used gear, years after it's been out of warranty. Not too many companies do that.
I've been so happy with my 410, I just picked up a used Classic 50 head. Good luck!