I have access to a Porsche Tequipment roll bar pn # 996-580-984-00, it states it fits a cab. I have a coupe. Anyone know why it wont fit?, I can't find any conflicting data, and my dealer is clueless. Is the seat belt mounting different n the rear of a cab vs coupe?, My thought is perhaps the roof with all the linkage in the cab makes for a shorter height bar?.

Any advice would be appreciated.

 

Like you said...I've always heard roof clearance was the difference.

Bars intended for fitment in coupes are designed to follow the B pillar and roofline as close as practical. Likewise, those for Cabriolets allow use of the factory windscreen and convertible top.

 

Totally different setup for a cab. It's a no-go

 

I have one (for a coupe) for sale for $800 if you're interested.