If you run some searches here, you will see that people have installed interiors from Fiberbirds, Grand Ams, and even a Nissan. The PISA 308 inspired interior looks good when done. There are some other options though.
Rob's 355 interior is the best I have seen.http://www.kitcarsforum.com...version-t7546.0.html
Spider Interior 355http://www.kingdomcustoms.com/products/ka004.shtml
I am sure that there are others, but they escape me at this time.