Hello Tim, I have made a similar bracket for the + 8 and drive our +4 with an speedster window..Changing from original to speedster takes 20 minutes. I have made an metal part with thread (the 2 outer bolts fit in) and glued it with polymer on the inside in place of the original nuts. Nr 3 on each site I can do without removing the dash. Most of the year we drive with the small windows.
Stefan
+4
+8
ARP4
