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Just be careful with the white plastic clips. You need to push down and twist. Expect to break a little part off of it.
Pre 86 ones dont have those white clips, i remember seeing a lens on ebay awhile back, i dont remember what side. I think they will interchange.
It's not going to be easy because the glass has a lip on it that keeps you from getting the knife at the factory sealant.
It seems to be some pretty tough stuff much like the PL polyurethane caulk I used to repair that one.
Possibly some sort of thin hook tool, and or warming it in the oven.
The glass will crack if heated unevenly.
I'd start experimenting with the one with bad glass.
Ya, i would cut the glue out with a razor knife, use a blow dryer to heat it up, so it will seperate.