Can someone tell me what I suspect to be true. Do the 800 cage and 900 XP cage have the same dimensions and mounting on the "A" and "B" posts? The difference is the XP cage has the "C" post that goes through the bed. Is this true?

The reason I ask is that custom 800 cages are getting harder to find. I found an XP knock down kit I really like and would just have to fabricate my own rear extension to make it work on my 800S.