Rubber valve (rocker top) gaskets

Hello all
Anybody know where I can get these from (as opposed to the cork ones), I used to order them from AVS spares but they seemed top have stopped selling them.
Kept looking and putting oil change off until I can source one, any leads would be appreciated.
Cheers

  :dontknow:

Just bought mine from Euro car parts.

Cheers will give it a look now   

Sorry spark but which part No. I need it for a 1.8 carb engineany idea's
Much appreciated :cry:

Dont know if anybody else is having issues finding this part but thought I 'd update this topic with the details just in case anybody else needs them.

'Euro car parts' Part No. for the gasket is 368440330 I used this on my 1.8 carb and 1.6 engines. Not sure what other engine's it would suit.