I found a 3 yr. old email from Whitetop (wish he were still on here, as his day 2 knowledge is missed). Here's what he said:
Greg
The new ones are 15x4.5 while the pre 2000 versions were always 15x4. Look
for the early style 15x4 from '67-74 era. The spokes/rim where a lot different.
The '74-2000 ones had a very ugly spoke design. -kinda fat looking. Very hard
to explain. The new 15x4.5 actually look closer to the '67-'74 versions other
than being 4.5 wide.
Crgar also changed the center cap about 1974. The old ones before that had no
registartion symbol and the edge of the cap was more squarer and the
lettering was a little different.
The caps today are way way off.
If you find a set that needs replated you will have to cut them apart
yourself and send to
www.platecorp.com They are one of the very few last chrome
shops in the uS that still uses Hex Chrome just like Cragar. Any other chrome via
Pauls, Custom Chrome, Advanced plating etc is way off. EPA chrome that 99% of
the shops are forced to use is very "dark" Hex chrome is almost white and
has a very light bluish cast. If you have a set that needs done do it know
because Hex chrome is being epa'ed out. Unless you want to send them to Mexico or
china like cragar.
Figure about $200 per wheel for plating. If the rims are rusty or pitted they
either will not do them or charge you an arm and a leg.
Hope this helps
Dave