For a small coupe with flat glass doors, it's fairly easy. Most any mid 50's to early 70's window regulators will work. I use flexible window channel I buy from a local body shop supply company, I buy it in 9" sections for about $20.00 a piece. Good stuff, works great. On the glass cars, I glue it in the door tops with urethene and fasten the bottoms in about a 6" section of u-shaped 20 gauge that is fastened to the door securely and the window channel glued to it.