Commercial style camper shell fitting

i tried to look around and find an answer but im not sure if shell will fit my truck properly.

I have a Regular Cab 2012 and this commercial style cap is off a 2011. They told him $700 when i contacted them about it, now they are asking if still interested. Not sure what these normally go for but i know my shell was $1300 for my 2010 and its just a base model ARE.

Its about 45 min away and im out of town for 4 days so figured i would ask to see what the folks here thought.

I appreciate the help.

 

I may be wrong but I think the 2nd Gen Regular Cab bed and Access Cab bed are slightly different dimensions, someone correct me if I am wrong.

 

I think the angles on the back of the cabs are slightly different- there was a post on here recently where one guy had gone one way or another (don't recall which) but I don't think it would matter with the aluminum shell.

 

And thats really where i wasnt sure... the angles are diff but that appears to have a straight back. Havent really looked at commercial/aluminum shells so dont have anything to go off of