I called and spoke with the guy at optic armor. Hell of a nice guy and has a lot of experience in the auto glass field as well as knowledgeable into the adhesives, adhesion promotors and primers we use.  I have tried many variations of many brands of urethane adhesives over the last 32 years in this field.

Optic armor is located by the lake of the Ozarks. They ride at ls dunes and have visited silverlake. 6 hr drive to ls ok though.

The reasons I mention the urethane adhesives is because their drop ins are produced with a frit to be glued in. The reason there coating works so well is its silicone based. So 220 grit sand paper to knock the coating off and the apply the black frit primer we use to glue a non glass frit model in. That model is called oversized as the square cut the cut to shape. Going that route is about $100 cheaper then a drop in. Found it very interesting that the windshields can be shaped in a sweet metal break and that they'll hold shape. He said you have to over bend it more then one would think but it works well.

Measured my opening last night and my max opening is 22x41".   They offer a line of drop in jeep windshields as well. Where I would prefer some curve just for asthetics,  flat is fine to. So surprisingly they make a windshield for a jk wrangler, they have a curve about that of the s 10 windshield. The over sized version block size is 18.7 x 56". That may not need be cut down in height, just width and radius the corners. He said jig saw and I have a 2000 grid wet sander at work I can use to sand fine tune it. Over sized  jk .25"x18.7x56" is $380 plus $50 shipping. 4 weeks out and it ordered one.

They use a 3m frit primer and Bostwick urethane #70-08a.

Maybe I'm wrong but the only advantage to rear engine configuration is if a person wants to wheelie at will. I prefer the front stay down.

Unique way to mount the rears for sure. Pretty nice car overall.

the fact that it has lasted for you this long tells me all i need to know!! i will need a windsheild to better protect my . thanks for the info and i need to measure.