Well would you believe it, I looked into this very thing a few weeks ago
Drum to Disc and Disc to Disc conversion kits to 41/2 PCD
Lots of kits around with prices starting around 1/2 a clap for basic kits going up the more bits you want to replace. ( arms, booster etc )
Scroll down this linky for an idea of what you get for your dosh from basic to the full monty.
http://www.dodgeplymouthbrakeparts.com/ ... asp?cat=10
Summit do 41/2" conversion kits as well a bit cheaper
More stuff here but won't let me do a direct link to page just index.
Scroll down to MOPAR ( YES it is there ) then choose Disc brakes and you get info for 41/2" A body kits
Basic kits from $400 at bottom of page
http://www.mattsclassicbowties.com/index1.html
Kit not needed by me in the end.
