under bed spare wheel hardware

[dmjlambert]

I bought my 1969 CST/10 truck a spare wheel, which it hasn't had before in this century. It is a fairly narrow wheel. 15x6.5 5-lug rally steel wheel with one of my 225/75R15 tires from when I had drum brakes and 6-lug setup. My stock under bed spare carrier has slightly bent rods, but I don't think they are bent enough to affect whether the spare will fit or not. The threaded rod with nut do not come even close to going through the spare carrier. How narrow were the stock wheels? If I were to buy new threaded rods, are their choices of lengths or all the same?
I don't know if I want to have custom rods made, because a crank-type carrier from a more modern truck may be my next attempt to carry this spare.