Anschutz mod220 air rifle spares?

[guidodg]

I am restoring an old Anschutz Mod220 match air rifle and I need the following parts:
Mainspring [old one is broken]
Piston washer
Piston\barrel sealing washer

Can anyone help?
The rifle shoots quite consistently at 490fps but I want to bring it up to spec to about 580-600 fps.
Anschutz do not stock the spares anymore and perhaps another mainspring from a different rifle will fit.
Any suggestions?
What would this rifle be worth?
Thanks
Guido gdg@iafrica.com www.delgi.com