Which diameter Gaz units do you have, it should be a 1.9" or 2.25" ID for either the GP or Gold coil overs depending on body size? I have 1.75" Dia Gaz Golds which take a 1.9" ID spring and use Eibach 1.88" ID and QA-1 1-7/8" ID springs with no issues. Eibach lists them under race springs. QA-1 Link
https://www.qa1.net/automotive/suspension/springs/1-875-id-coil-springs You can get them through Summit and probably others.
I've got a set of 0800.188.0300 Eibachs that could use a new home if that would work for you.