Rally Wheels
 

I would like to take the centrelines off of my 67 Coronet, and put factory rally wheels on it. What do the factory wheels look like ? What should I be looking for ?

Like these in a 14" x 5.5 or 6"....

Do these also come as a steel wheel,with beauty rings and center caps ? There is a 1966 Plymouth Belvedere being advertised as a parts car here and it has steel wheels that look very similar to the Magnum 500 wheels except these aren't chrome but have beauty rings and caps.

Go to Specialty Wheels and take a look at the Mopar section.

http://www.specialtywheel.com/wheel-showcase/mopar.html

The later style 70's did have a trim ring

Correct. '68 and earlier were chrome, '69 and newer had trim rings....

So I've located a set of Magnum 500's. However they are from a 1973 Charger, will these bolt onto my 1967 Coronet,and give me the clearance that I need ??

Link you might want to dig into. Great customer service.
http://www.wheelsanything.com/

You should be fine I had a set of the Chrome Magnum 500's on a 66 Coronet.
Best wheel ever made !!!!!! Clearance is tight on a 67 regardless of what wheel you use