I rebuilt mine using the Superformance kits with no issues https://www.superformance.co.uk/308/brakes.html Sent from my iPhone using FerrariChat
You can get rebuild parts here, or they offer a rebuild service ($349/pair!) or complete calipers: https://pmbperformance.com/. If you search this forum for PMB Performance you’ll find several previous discussions. I bought aluminum rebuilt calipers from them around 10 years ago. They’re go to guys for Porsche calipers, but the 308 used the same ATE front calipers as a 911 and the same rears as a 914 GT. On the web site, search for Ferrari. Gordon
