Hey Jeff, these will get the job done inside or out.
http://www.finishlineaccessories.com...roducts_id=370
There are cheaper alternatives that can be opened and fit around the bar with it in place in the plumbing aisle for finishing off pipes through walls. You could also put rubber grommets in there either by sliding the bar down through them or by cutting the grommet through and threading them in around. What is your roll bar diameter I may have some pieces to try. Put some pics in your gallery when you get a minute you're a hell of a car builder!