Help please. I recently purchased a relatively clean 1964 Chevy standard cab to replace a not so clean standard cab on my 1966 Chevy C20. As I began looking more closely it became obvious that there were/are differences in the inner attachments where the inner fenders attach to the firewall. The 66 has large round mounts but the 64 does not. Is there a simple remedy for this or do I need to find a newer cab? Thanks in advance.