Join us on Facebook: Search for 'ConcoursMustang' Private group!https://www.facebook.com/groups/concoursmustang/Indiana SAAC Fall Classic , French Lick, IN Oct 11-12http://www.insaac.org/SAAC National-Sanctioned Concours Event
Although I can not attest to the originality of mine, I have taken 2 apart and both appeared to have had a paper/felt gasket. I assume an o-ring would work fine, but not sure what was originally used.