My son has a '91 RS and I was trying to check his L.P. and H.P pressures due to his car not cooling sufficient. it still has the R-12 in it and I happen to have a set of gauges and probably 10-12 lbs. of R-12 left over from the old days. I have an adapter for the H.P. side but it must be for an older model system than his. the schrader vavle on the adapter does not reach the schrader valve on the service port.

I need to find the correct service port adapter.

Can anyone help?