The rims are the same from HQ through to HZ but they are date stamped if you really want to get anal and made by different manufacturers. HQ had the rounded trim rings, not positive on HJ but HX and HZ had the squared trim rings.

Your original trim rings should be able to be re-chromed as long as the rust is only surface. Will have to check the ones I have as I seem to recall them being stainless steel like the HG GTS hubcaps..... :confused: