Hi Jeff,
I replaced the 2 small Bomars with (size 10, I think) Low Profile Lewmars, which were the last 2 on clearance from Defender. I needed to cut out the deck opening about 3/8 on all sides, but it was all in solid glass - no core. I sanded and painted the exposed deck edge below the frame for a pro installation look.
With compound and a polisher the ugly forward Bomar cleaned up nicely. I did not remove the light from the plastic frame and grid, because I was afraid it might leak after I "fixed" it.
Silicone was used to bed all of the hatches - leak proof the first time.
This was probably one of the easier jobs on my long list this year...
Regards,
Jeff