Hi Andy
I have recently got a Sharp Ace and have received lots of invaluable advice from a member on here OLD JUD who is the resident expert.
What I can tell you (because OLD JUD told me!) is that the stuff you would need from chambers would be the valve springs but the O-rings are all standard sizes so can be sourced from many places.
I know that the Innova is the easier rifle to work on compared to the Ace and Victory.
Innova - most popular and numerous Sharp model
Ace - less available but considered quite pretty
Victory - Rocking Horse Sh.. I mean Hen's Teeth
Pan-Target - I don't anything about this Sharp model
Hope you enjoy your resto project.
Cheers
Opportunity is missed by most people, because it is dressed in overalls and looks like work.