Most of the tire carriers I've built for customers and friends I've ended up using rolled solid steel pipe that I've out in a lathe and had lips machined on the ends, then just throw some small trailer bearings and races with it. As for the latch, a 1/2 inch spring latch has alway done well for me
"Good work isnt cheap... Cheap work isnt good"
2002 JEEP TJ (Apex Edition)
4" rough country lift, 2" body lift, 35/12.50r15 wrangler MT/R on American Racing rims, ~BuMpIn StErEo~, Warn Front Bumper, Genright STINGER W/ Grill gaurd, Custom LED tail lights