vehicle: 1995 chevrolet suburban with rear ac

I can't seem to find a part number for the o ring which goes between the evaporator and the accumulator. I replaced the evaporator and accumulator and used the supplied green oring but had a small leak. I had to crank down really tight to get it to stop.

I did not replace the o ring on the line going into the accumulator and it is sealing fine. I have had bad luck with these aftermarket green o rings on a honda.

I would like to replace the o ring with the oem black o ring but cannot find a part number.

The online parts diagrams I have found only show the lines not separate call outs for the o rings.

I assume the o rings going into and out of the accumulator are probably the same size if that helps.

The interior diameter of the o ring is around 5/8". Probably a little smaller.

I used an aftermarket evaporator and accumulator. Maybe regretting that a little.

I appreciate any help anyone can provide.

This page does show the separate o rings #4 but does not list them for sale.

https://www.wholesalegmpartson...&ukey_category=19390

If you can get me the specs, I might have them.

Here's the whole o-ring kits:

Four Seasons® - A/C System O-Ring and Gasket Kit
https://www.carid.com/four-sea...33214#specifications

Replace® - A/C System Seal Kit
https://www.carid.com/replace/...5901310&url=10233214

One by Santech is out of stock until further notice.
Santech® - A/C Line O-Ring Kit
https://www.carid.com/santech/...7768045&url=10233214