Just take camera phone pics and post those? Chassis works makes an "exact fit" "pro touring" Roll cage. I have one in my camaro and the fit is descent but the cage is pricey to have to do all the tube notching ,welding etc yourself. The cage fits a little tighter to the body but nothing to justify the price in my opinion.
The only way to truly stiffen the car up is a cage,subframe connectors and the cage tied into the subframe connectors and forward down tubes into the engine bay.
I made my Roll cage Harness bar removable for passengers but in reality who wants to sit in the back of these old death traps. Without a cage getting hit by a news car would be bad for the old car. A cage could also make it worse for any passenger if your not properly secure to your seat etc.