[Jack21]

CMC eh? Any parts still on "Backorder"?

Most street rod suspension shops have IRS kits. Look in Street Rodder Magazine, start checking web sites and getting catalogs.

FFR allegedly has their IRS that can be retrofitted to other Mfg.'s kits.

The size wheels you use depends on what suspension you use. 14 x 6 is ridiculous. Most Cobras use at least a 15 x 8, 5 lug. Some are running 17" wheels.