I need a part for my cab...

[Sparky6string]

... but I don't know where to get it or what it's called. I want to put a new back on my Marshall 1965a cab that's ported but I need the part where the cable plugs into. What is this thing called and where do I find a new one?

http://i6.photobucket.com/albums/y238/Sparky6/Guitars/DSC00583B.jpg

[Dave C]

It's called a jack cup...should be able to find this at AES, Mojotone, Hoffman...etc

[Sparky6string]

Thanks Dave I found one on Ebay.