Yes, I know all about the urethane vs. butyl issue. I replaced enough butyl windshields when I had my shop that I was easily swayed by the arguments for urethane. It's not too hard.
Clean and prime the frame like you would for butyl, then cut some 1.5" strips (6) of the foam dam and place evenly across the top and bottom of the frame. Set you glass on them and the factory stops and check all your moldings and the adjustment of your stops.
The replacement windows are thinner and a shade shorter than stock so there is little room for error. Once you have the windshield where you want it. Put some tape across the gaps to help line it up on installation. Also scribe around the perimeter of the window so you know where to put the urethane. The foam is black so you should paint the inside of the frame black so it doesn't stick out when you look through the glass. The foam dam should be about 3/16" - 1/4" in from the scribe mark, but not so far in that it looks crappy through the glass. You can adjust it after you put it down but not too many times. Once the dam is in place, apply the urethane (get a medium or slow setting one). The urethane bead need only be a little over level with the foam. Lay the glass in place and do not over compress it, but make sure the urethane is sealing it. Let is cure an hour or so and put your stainless on!
