Trans Dapt part# 7066 adapts 5 on 4 to 5 on 4.5.
It is 1" thick and as with all adapters, you must periodically re-check tightness. I ran these for about a year on my Duster until I installed my disc brakes and 8 1/4 rear axle. I had no trouble, but did not subject them to high speed cornering...