On my early 240z there were small plastic clips that help the inspection door lids closed. On the later 240z they were switched to metal. My plastic ones have cracked and are broken off. Does anyone know where to get new ones or am I forced to use a later door with metal clips? Thanks.

Unless you come across someone making them (and I will eventually) they are unobtanium. You are going to have to really dig to find them and the last set I saw for sale went to Carl Beck for $200 - fact. I would write to Beck and tell him you are looking for them. Welcome to the low vin club!