ok I know you bought a cd player already so I guess this is moredirected towards the ( have not bought yet people like me that do not want to do any cuttin )
I found this cd player and by the looks of it, It could possibly fit into the stock cut holes of the old AM radio. for the tuner knobs holes
www.lmctruck.com sells some original looking knobs hole fillers that look like the origiinal am radio knobs. anyway here is the link.
http://www.energenix.com/alpine-cdad852.html
and here is what it looks like:
Just a thought..
--Broken_down?
PS. lmc sells a tape player that fits the stock cuts..lol who wants a tape player..lol well you could geta adapter..LOL