N/A S.A.R. .177 air rifle

I recently bought a little SAR Japanese air rifle at an antique store that was in pretty crusty condition. I've disassembled it and cleaned it up and i need a couple of parts. It has a leather seal that needs replaced and the main spring is pretty crooked and weak. From what little I have been able to find these little guns are similar to the Slavia 618 and the GECADO 22 in design. I have each of the others and this is the same over all size. I'm hoping to get it working so each of the G-kids will have one to shoot.
I'm looking for suggestions on where to source parts. Thanks.
 
Ill have to do a complete re-bluing.

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