Does anyone know where I might find the specifications for the O-ring used for the INLET to the condenser( or better yet a replacement part). After 20+ years I developed a (large) leak at this connection. I ordered a kit from O'Reilly Auto Parts but there is no O-ring with the same thickness as the old one on my truck?? I could measure the old one but I am concerned that it is deformed/compressed and the results would be inaccurate. I tried some of the ones in the kit--none would hold a vacuum.

Any advice would be greatly appreciated as it has been hotter then you-know-where here lately and the worst time for the A/C to blow a cork!