Most common tubing bender die sizes?

[lump-dog]

I'm curious what the most common tubing bender die sizes people are using. I'm going to be utilizing 1 3/4 and 1 1/2 for my roll cage and engine cage, what other sizes are popular for general fab work. Any benefit to utilizing the "in between" sizes (1 5/8, 1 1/8, etc)? I'm curious what you guys use most, and where you use it.....

Also, do the jd2 dies and the pro-tools dies interchange on their manual benders?

-lump

[mfs]

i have 1/2, 3/4, 1", 1 1/4, 1 1/2, 1 5/8, 1 3/4, 2" and use them all.but u sould just buy them as u need them.
smaller dies are used for fender mounts, cell mounts,etc.
the 1 5/8 and 1 1/8 are used on mostly drag car stuff.