Dan has two types. One for sure fits a GTD. I have one of his in my car. I think that most of the English cars GTD, KVA, MDA, CAV (because it was originally a GTD way back when) are the same windscreen. The Pacific cars, RF, DRB, NZ (and its linage) are the other flatter shape. If anyone knows for sure if I am correct then chime right in.
As to the US cars ERA, RCR, and I'll put SPF in this group as well, I don't know. I would guess that ERA is the same as the original. RCR ? I bet we hear from Fran real quick. And I have no idea where the SPF's are coming from.
Dan is a straight forward honest guy. I bought mine from him years ago and I know they aren't that cheap anymore so I won't tell you what they cost me then. I seem to remember a promise not to so I won't. He did me a big favor and I am still grateful. He sent my two windshields Via Greyhound on the bus in a custom box that I sent back to him. The shipping cost was about the same as a ticket in a seat from Ohio to Calif. Pretty cheap. I sent the box back to him and it was next to nothing to do so. This is really the best way to ship a windshield across the US. The box never leaves the cargo hold in the bus if you put in on a direct transit trip. You simply meet it at the bus depot like you would meet a passenger. Compared to shipping from England to California at the time..... well lets say I could have flown to London and bought it another seat next to me for the trip home cheaper. If I remember correctly it was more than a $1000 in shipping costs alone.
Don't break your windshield!
And for those of you buying a new car and are at the front end of your build buy a replacement and put it away for later. This can be a very difficult thing to source years from now and you can get the shipping cost for for free now with the original purchase of the car.