It might be easier to replace the socket that it goes it - that bulb is somewhat rare and rather $$$ to boot!
This is what your socket looks ?
I would replace with a harness that can be adapted to fit inside your housing - and use a "standard" LED bulb of your choice. Fitting the next harness to the housing might be an adventure but in the long run well worth it! Two LED bulbs will cost less that the two original ...ifn you could find them and ship them. And even a harness from a junk yard car can be made to fit with a little ingenuity - car bulbs are easy to get in LED format.