Anyone know of LED's for the rear marker lights on mid 70s on the tail lights?

Trying to figure out what to do for these lights:



Red Marker Light 510984-01 [510984-01] - $12.95 : Out-of-Doors Mart!, More Airstream Parts on-line than anyone!



I want to do LED's, but I cannot find a direct replacement. Trying to avoid using my old lens and case to retrofit LED's into it because its old, not replaceable and I fear the lens could fall out.



Any ideas are welcomed.

Thanks!

Micky