I see them supposed GM approved ones for sale on ebay. Are they any good? How to they fit and compare to OE?
Remember that there's no such thing as "GM Approved" restoration parts. When you see the "GM-Licensed" hologram sticker, that just means that the supplier has applied for and paid for the GM license and pays a per-piece royalty fee to EMI (Equity Management Inc.), the outside third party that handles GM licensing for them. If they're lucky, they may get access to the original tooling (if it still exists and if they have the machinery to install it in). GM isn't involved in the manufacture, distribution, or sale of the parts, or in any quality checks or approvals.