Looking to make some 6 x 9 spacers to fit some 6 x 9's into the rear door of my jeep but am just having a mind blank on how to make them. Have done this loads of times before but having no joy remembering how to do them. Any template i get off the web is too small.

All i keep doing is dwawing around the outside of the speaker then i'm left with an oval piece of 6 x 9 then trying to cut the middle out and it all going pete tong.

Anybody got any ideas?