I put Pioneer TS-A6870R's in the rear of my wife's
Cruiser they are 6X8 3 way speakers and fit right in
no problem. In the front doors I put Pioneer TS-A1767
they are 6 3/4 and also 3 way speakers and came with an adaptor
plate fit right in no problems.If you want to find out what speakers
fit your Cruioser go to
www.crutchfield.com