Thanks for the plug Jeff..
Ben.
If you can still fit the original Bosch lamp unit into the rim you have (Carbon or Chrome), then the adapter ring should also fit. You will then be able to use an off the shelf 7" unit of your choice... I'm with you on the LED units, they are obviously a very good illuminator, but as you say, the looks don't suit a classic Monster... It's all down to taste.
I'll post a graphic picture this evening, to show how to measure a rim for suitability. It should measure 186mm (I think) across the opening in the rim.