Ernie McDaniel in Davie, FL. One of the best roll cage mnfr. in the nation. Expensive, but good. Chrome-moley, steel, you name it. Will put you on waiting list. Waiting period, usually 4-8 weeks.
Before you commission anyone to do the rollbar, spend $10 and get the NHRA rulebook.
That way there's no arguement as to how it HAS to be made, and installed.....
Your post says "rollcage"... There's a significant difference in that and a rollbar...Be aware of what you are going to get. There's added items w/ a cage that don't apply to a bar...