Currently working on this myself but for different reasons.
My Cat Eye parking lights had messed up wiring/connectors, and I didn't want to spend $100 for a new pair.
Instead, I cut the back of the brass connector out and removed the bulb socket.
The housing diameter is approximately .77".
I ordered these 3/4" Mini LEDs with rubber grommets from Amazon ($10 for 10 units) which should fit in there snug as a bug.
Then, just wire into the factory harness with weather pack connectors.
Still get to keep the sealed beam look, but with 100% increase in brightness.
Will report back once DHL delivers the lights.
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1968 J3500 - 1985 CJ7 - 1998 Grand Cherokee 5.9 Liter Limited - 2006 Grand Cherokee Limited
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South East Offroad Activist