Brake booster check valve rubber seal

[r00b]

I installed a new in bag NOS check valve and had a large vacuum leak, the rubber seal ripped. I bought a new valve from deloreango, It's too small and looks like it needs the NOS seal. Where can we get the seal without the valve, would a rubber grommet work?IMG_20200924_183006.jpg

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[DeLoreanGo Arran]

A rubber grommet would work if it has a perfectly tight seal.... I have never been able to find the correct size, but we do still have a few NOS ones in stock - just sadly a little on the pricey side: https://www.deloreango.com/us/brake-...alve-seal.html