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I have four Collector Edition wheels on my C4. All 4 wheels are 9.5" wide.
Are these the same wheel size and offset as the GS wheels offered the same year?
I'm now looking for two 11" ZR1 Style to go in the rear. I think I'm supposed to go with 50mm offset but I'm not sure.
Also where is the best place to look for a pair of these 11" wheels?
You neen the 50mm backspacing for the 11" rims. AFS and OE wheel distributors are a couple among many that sell reproductions. I think some of the folks here have had good luck with Tomzwheels and they support the forum too. The others are on Ebay. I'd look into getting a set of 4 as the appearance differs slightly from the stock rims. I personally have the OE's and I am happy with them.
The OE GS Wheels are lighter than the replicas too, but I don't have a good enough scale here at work to compare them for you.
Mine are about 3lbs heavier comparing the 9.5" rims. I don't think you can get the 50mm offset 11" silver A-molds (gm factory), just in black; and they are much more $ compared to the repros.
I got my polished set for around $500 for the set of 4.