The glass should be DOT stamped safety glass. If not, the manufacturer/builder/previous owner got away with something.
And you are luck you’ve never had an incident. Laminated windshield glass crumbles into small, dull “balls” of glass. Go through normal plate glass, and you will have serious problems. so even of there is “normal” glass in there now, you want laminated safety glass.
TD windshields are perfectly flat. The top and sides are straight. The bottom has the slightest curve to it.
And auto glass place will be able to get DOT stamped safety glass in the proper thickness for your TD.
The entire windshield, glass and frame will come off your car as a unit. The top and sides of the frame should be one piece. The lower bar of the frame is removable and the glass will simply slide out.
Paul Mossberg
Former Owner of a 1981 Classic Roadsters Ltd. Duchess (VW)
2005 Intermeccanica Roadster
If you own a TDr and are not in the Registry, please go to https://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)