Thanx Claymore, Alan, Ray as always.
No, I haven't been checking it with the windshield, Tony. I did make cardboard templates before I cut anything to keep me out of trouble so keep your fingers crossed for me.
In2Deep, that chair has no mfr markings on it that I could find. I checked around the office and found out that they got it on sale from Office Depot about six months ago (reg price $29 - sale price $10!). I couldn't find it on the office depot website but you might find it in one of their big catalogs.