Thanks for the link.
* 1997-2003 take note!
Regular cab = 10
Super cab = 6
Which means a regular cab has more RAKE.
So, even if the bed length is the same.....
Super Cab shell on Regular Cab = YES (with extra gap at top)
Regular Cab shell on Super Cab = NO (rub paint and third brake light)
I believe the chart is incorrect for the '97-'03 long bed.
It lists cab degree as '6', pretty sure the short & longbed regular cabs are identical (cab degree = 10).
Not that important because a longbed supercab is rare and that's where the issue would come into play.