I'm currently replacing the A/C system on my newly acquired White 89. The previous owner lied to me about the quality of the system and I found out that the compressor is pretty much junk. So, I'm pulling everything off to repair or replace. I was able to find all NOS parts online and thru work. All of the Orings in the A/C system are pretty much generic A/C rated Orings except for the Manifolds. The Manifolds that i bought came with the correct Orings but the Compressor that I bought did not. The Manifold Orings are round in diameter but they are oval in shape. They are taller than they are thick. After pulling everything off and examining the parts, I've decided to reuse the Manifolds off the car and save the ones that I bought for my 91s engine dress up coming next summer. Since the Compressor didnt come with the correct Orings I now needed to source some correct ones. I didnt want to risk prying the ones out of the new Manifolds and possibly damage them. After searching the forum, I couldnt find any information or part numbers about these particular Orings so I did some detective work and found what I needed. I was able to get them at my local Oreillys but only after I did all the work. These will not pop up in any database, Oreillys, Advanced, Rockauto, etc.... They dont even come up in the Ford system at work. Here is what I found.
The original Ford Manifold Orings are red in color and measure
.745" inner diameter
.108" wall thickness (laying flat)
.139" height (laying flat)
Ford #390697-S
Motorcraft #YF-1475
UAC #0116G-10 (green)
4 Seasons and Murray #24621 (green)
The Murray Orings are the ones that I found at Oreillys. Not cheap either. Cost me just under $10 for 4 with my discount. They are a very good fit though and I dont have any concerns about using them. I hope this information can help someone else down the road.


The original Ford Manifold Orings are red in color and measure
.745" inner diameter
.108" wall thickness (laying flat)
.139" height (laying flat)
Ford #390697-S
Motorcraft #YF-1475
UAC #0116G-10 (green)
4 Seasons and Murray #24621 (green)
The Murray Orings are the ones that I found at Oreillys. Not cheap either. Cost me just under $10 for 4 with my discount. They are a very good fit though and I dont have any concerns about using them. I hope this information can help someone else down the road.

