Part number 05-00711 is a kit of two O-rings for the GAS125 Gascolator, one is the seal between the bowl and the body of the Gascolator, and the other is the filter retention O-ring.
Part number 05-00712 is a replacement screen for GAS125.
This is the correct Andair o-ring that comes in Andairs factory packaging and is the same you would get if you ordered direct from Andair however, it is a poor fit. The grove it is going in is 2.5mm X 39mm. The o-ring is 2mm X 39mm. Since the o-ring is a loose fit it often gets caught and damaged when the bowl is inserted into the receiver. It also provides minimal sealing contact. I have found that a 2.5mm X 36mm o-ring (Viton 75, which is the correct material from Andair), provides a much better fit and seal and is far less likely to be damaged when installed. This is after I damaged multiple Andair o-rings and then went on a hunt for a better fit and tried literally dozens of different sizes.