[Jack21]

DV is right. The side arms that hold the windshield to the body have to be installed so they exert no inward, or outward stress on the glass frame when shugged up. Shims, washers, or both must be used.

My glass options were 120 English pounds (x 1.4 exchange rate) for glass only plus shop installation here, or 360 English pounds (x 1.4 exchange rate for glass already installed in new frame, and new sidearms, and no additional installation cost. Almost a wash, $$$ wise.

Not complaining about Finishline, they have nice stuff, they're easy to deal with, and you have your parts tomorrow. But in USA, old British car parts are specialty items with specialty prices. In U.K., these pieces are OEM replacements, with OEM replacement prices. (About what the Brits must go through getting parts for their old Mustangs in U.K.)

I will share this bit of frustration. Replacing the same glass and frame should have been a direct swap out, right? Wrong. Brits made some minor design changes so the glass is the same, but frame and sidearms aren't. Windwings needed new mounts made, and had to have the sidearms redrilled and tapped for the top mounting brackets.

There is a USA made glass and frame that may be functionally and appearance wise identical. What may be involved in installing it remains to be seen.