The open bow and the closed bow changed bottoms in different years. I believe..... 2000 went step for closed, and I know 2001 went step for open bow. They also cut the windshields down a bit in those years.

I had a 2001 open bow, built in Sept of 2000.

Laminated wood to fiberglass interiors also changed at different years. Around 2002.

Lonnie put all new fiberglass interior and head liner in mine. It was much nicer.