I managed to scrounge up a set of 15x8 rear slots and a set of 31x9" slicks.
Had the front runners and slicks mounted up with tubes to be able to roll it around again.
Front wheels are 3 1/2" Anson slots.
The rears are about 5/8" from the leaf spring on the inside. Maybe a 1/2" from the inside of the 1/4 panel lip.