I did cut the back off where it butts up against the dash last night. With a little vaseline on the leading edge I was finally able to get the W/S closed enough to get the handles to screw in. Took about an hour, but that was after about 3...
The OE one is 'fat' too. And it takes time to squish down. Like measured in years. It seems wrong to have to trim something that is new, but sometimes that is what it takes.
I remember reading over a decade ago about someone putting a strap...
Did you find a year appropriate spacer? I'm in a similar boat, however I have a 68 with the vent holes. However, the windshield won't even come close to closing. It's pinching up.
I have a City Racer one I'm thinking about trimming down to fit.