When TCane was helping me gather the stuff I need to do my 80 240 ac he got this package from Carlisle Auto Air...
It is part number 100

and includes the following green O-ring seals:
quantity , part number, description

3, 233-750, #6 O-ring
4, 233-751, #8 O-ring
3, 233-752, #10 O-ring
3, 233-753, #12 O-ring
2, 233-859, liquid line O-ring
1, 233-857, Pressure switch O-ring