Originally Posted by Edgemontvillage
Brian, thanks for such a comprehensive reply. I note that all the part number references are for 14 inch wheels where the Z/28 YH rally wheel is of course a 15 inch diameter. In the "15 inch Z-28" thread link "Zuma", in Post #7, he provides 2 pictures of what he describes as an original trim ring on a YH wheel that clearly shows the oval / captured stem cutout. I question if this is reliable information because if you click through to the link in his signature to pictures of the '69 he restored, its an SS not a Z/28 and tires in the photos match those in the posting. There's no way to tell if these are 14" or 15" wheels/tires and importantly if they are original Z/28 15" trim rings or something else. Have I missed something?
Yeah I'm sorry since I have 14 inch wheels I lost track of the final outcome for the 15 inch series. The GM parts catalog for 72, and 75 that these part numbers came from should have all the GM wheel sizes. Ask and they should be able to pull that info for you. If I find my uncles 72 catalog in the garage - suspect a buddy"borrowed" it - I'll post it for you this weekend. But I'm sure someone will beat me to it.
The long and the short as to the "correct" style and design of the Rally wheel trim rings for which application and year is mute after the mandated safety recall as GM only produced one hole shape and style and this replacement part became the standard part for all lines. That is just the way GM handled it. They made different depths and diameters but all have the same design. If you went in for any service while the recall was active, the dealer ripped off the suicide rings and slapped on the replacement and billed GM. It was easy money in their pocket. So in reality it doesn't matter 40 plus years later if the hole or step is correct as original show-room floor unless you have a show car.
The beauty is that once installed those two features disappear into the magic that the stainless rings, chrome derby caps and argent silver rim paint combination does to the human eye. No one except a competition judge is going to say hey you have the wrong rings.
Just buy quality as the cheapo China rings are notorious for loosing luster after a few months. Quality NOS pre and post recall design rings in all sizes hit flea bite all the time if you are looking for that, and if you catch a sleeper you can spend less then a grand on them, but quality perfect used ones for cheaper then Ricks also hit all the time. I picked up a set of 4 for a couple of hundred a while back for a buddy's ride while he serves over in the sandbox. One small area that buffed out and they are perfect post recall.
Hope that helps you find peace in the trim ring patch.