cap/canopy sizes for a 99 ext cab ????

i have a tonneau cover on the back now but i'm looking to buy a cap

the short of it is i'm not to sure what size i should be looking for

and ideas ??

the box measures 6' x 5' 3" (outside)

 

Whether buying new or used, all you need to do is check for a cap designed for a 1995.5 - 2004 Tacoma XtraCab. You could also use a cap designed for a Regular Cab during these years, but there'll be a noticeable gap because of the differences in rear cab wall profile.

The main variables you have to watch out for are height (cab high / mid-high / tall) and options.