Mounting CD player in dash?
One option you may consider is mounting the CD in the Glove box. This way you can preserve the classic look of the Dash (if this is something you'd like). If you go for the dash mount, you will have to buy a mount. Many of the Radio/CD units require these universal mountings. This will also require cutting the opening from the original radio mounting. I would also run new speaker wires, and power leads while your at it.
One last option you many consider, depending on it you have a console, is building an under dash console. Just thinking out loud.