PCM 40A O-RING R047186

Does anyone know the measurement of the PCM O-Ring R047186? It is part number 105 in the 40A transmission. Page T2-1 of the transmission manual. The transmission requires 2. Looking for measurements of a new one or possible cross reference to a part I could get at Napa, Autozone, OReilly's, Advanced Auto, etc.

I ordered the main cover seal and large o-ring but didn't notice these on the diagram when pulling the cover to fix a transmission leak. Seems silly not to replace them while I have this front cover off but don't want to wait for parts to ship from a dealer and hope I can find something local. The old ones look like squared o-rings but they might just be flat from being in a transmission for 21+ years.

Thanks

Thanks SkiDim was kind enough to help me. I placed the original order from them.   6mm id x 10 mm od x 2 mm. I have to say SkiDim and NautiqueParts are both great shops. Wish we had a full service CC dealer in Denver. Hard to do when boating is a small segment and boatable water is minimal.