I'm not sure whether this will help at all. Here's a photo of the seal I put in.
It was a struggle all the way. I tried starting the T at one end and pulling it all the way through to the other, but that was a no-go. So I just worked it in, 1/32nd of an inch at a time. I had the windshield on a piece of plywood covered with carpet held up by two saw horses. The driver's side of the windshield was down.
I stuck the long side of the T into the slot, and pried the other side in with a narrow bladed screwdriver. Now, this goes very, very slowly, like I said, 1/32 of an inch at a time. I seem to recall it was going in so slowly I could hardly convince myself it was going in at all. I know I pulled it all out in frustration a couple of times.
One thing I did was boil the rubber in water to help soften it up a bit.
Also, it was probably in the 90s out when I did this, and I think the heat makes all the difference in the world in terms of the pliability of the rubber. Maybe you could use a hair dryer to soften it too. But, it must have taken an hour to get it done, and believe me I almost felt like giving up at times. I was sweating like a pig!
This piece came from EBay, it was part of a set that included the bonnet buffers, etc. One thing about Moss's catalog--do note there are two different Bugeye body to frame seals. Make sure you have the right one.
Oh yeah, another thing. You want to have the end of the seal sticking out past the end of the windshield frame somewhat, half or quarter an inch or so? I can't remember whether it goes over the windshield post gasket or under it.
But you don't want that seal to be flush with the edge of the frame or you will end up with a gap between the seal and the windshield post gasket. I did this wrong, LOL. But I wasn't ripping the whole thing out and starting over.
I also had to trim the rubber around the wiper bezels too. No big deal.
Charlie