Sorry, I linked to the wrong one, here is the adapter for Contours:

http://www.scosche.com/scosche/speakers/SAF68.asp

It should fit the larger speakers you have. For your smaller ones you could cut out a template with plastic or wood from the Scosche adapter and just cut a smaller circle out.

1999 Blk/Tan CSVT #654 - SOLD 2003 Suzuki SV650s