We believe that all of our Roadster roof tops were manufactured by one (European) source over a relatively short time period, especially when you consider the sharp drop in sales/demand, by late 2005. This theory would indicate that the parts are identical.
By 2009, window detachment was becoming widespread and continues to this day. In Sep/Oct 2011 Chrysler LLC published a Service Bulletin specifying top replacement and offered a free 10 year/100,000 mile warranty (by US Mail) to owners of the group of 2005 model year Vin #'s that were shipped to 9 States. To our knowledge, they have never officially stated why those cars would receive special treatment.
The N.H.T.S.A. (safercar.gov) is currently investigating this matter. Please register your complaint with them ASAP. (Attention; Mr. John Abbott) We contend that this is a serious failure of the roof structure itself which negates the critical function of weather protection/resistance, and cannot be considered reasonable nor acceptable by anyone's standard.
Outside of the 9 States; Chrysler did pick & choose who they would help and for how much $. (If you complained to the Corp.) Some were offered a fair deal while many others were flat rejected.
Good luck & Thanks for any help.