Here's a couple of older CGE/Fortran signals with louvers fitted into cutaway visors. Also one of the last 8-8-8 signals remaining in Toronto, this 8-8-8 was replaced by a 12-8-8 poly LFE last April-May.
I like cutaway visors too but it looks really bad when they mix them with louvers, tunnel or full circle visors would have looked a lot better with louvers.
You might find the visors and the gaskets on eBay, and there are some places online that sell signal parts too.
You might find the visors and the gaskets on eBay, and there are some places online that sell signal parts too.