I bought these off eBay for my GC8. Flipping between tabs, I didn't notice it said GDB, not GC8. No wonder they seem a bit small. They're in great condition and include bulbs and even the plug stub from the car.
$300, which is just a little less than what I paid.
[edit] Here's a link to MY posting on ebay:
https://www.ebay.ca/itm/283710292655