Convertible frame differences for spiders

[Squidders]

Hi all,
I am looking for some information regarding the differences between various model spiders and their convertible frames. I have a 1980 CSO and was wondering if anyone knows if either CS 1600/1800, CS1 1800, CS2 2000 (Carb), CS0 2000 EFI frame and its parts can be interchangeable to my CSO.

I was wanting to replace the front top bow on mine and was offered what looks like a CS1 frame.

Any advice or information would be greatly appreciated.

[Squidders]

Is anyone able to offer up some info.

[courtenay]

This might help...
http://www.robbinsautotopco.com/fiat.php

It looks as though the change to the header bow was made in 78/79 so CS1 (pre 79) bows will not fit but CS2 and CS0 are interchangeable. In other words regardless of whether your '80 is carb or Fi the top bow will be the same.

[Squidders]

Thanks Bruce appreciate the reponse and link.

[vandor]

As far as I know the only difference is the shape of the front edges of the top bow, which changed with the CS2. So CS2, Cs0, DS0 are all the same.
The rest of the frame is identical AFAIK. I've seen info that said that the CS2-on frame was taller, but when I measured my own cars I found no difference.