ac o rings

I'm soon starting on the ac to get it working in my '72 Riviera. Have got hold of all the part i need, but not the o rings yet.
Since all my o rings are missing, i'm wondering about the size of them and how many of each size i need ??
Have looked in my partsbook, but did not the size
Or do any know whre i coud buy a set of o rings to my car and ships it outside the US??

 

Try here:

https://www.ackits.com/pc/CP3011/ve...1988+&+Prior+General+Motors+System+O-ring+Kit

 

Thans a lot for the link, Scott :TU:

 

Contacted ackits, and they dont ship outside the US
Anybody else got a tip for me??