Mike:

I installed a set of Rosin sun visors in my IVP using the supplied template for mounting.  The mounting posts were epoxied into the cabin top before the upholstery was  added.  I supposed they could be retrofitted after upholstery with a little skill and cunning????

I had to trim quite a bit from the pilots visor so that it would fit into the space between the door and the overhead console.  I could send a picture if it would be helpful.  Maybe all the trimming might not have been necessary if I had installed the visors after the upholstery.  Hard to say!!!

Anyway, the important thing to watch is the location of the Red setscrew in the visor.  Make sure that it misses your head at the full extension of your shoulder harness.  When I had my ground accident in Las Vegas a few years back, that little red adjusting screw put a 6 stitch gash in my head. Good luck  Bill Hogarty