When I rebuilt my Scamp
I did not want to deal with rusty sockets and intermittent and weak tail lights
so I fitted these Harbor Freight lights
inside my old round Scamp lights
They fit right inside the old lens with only the socket sticking out too high.
I took a Dremel tool and cut it off and soldered wires directly to the nubs left going into the light
A little RTV sealant to hold it in place.
For the driver's side I put some strip LED white lights
in over the clear area that is intended to "Leak" light
onto the tag at night. Sorry I don't have a picture of that.
So The red shines right through the red lens with little if any loss of brightness and is much better than the old bulbs.
This shows $14.99 on the Harbor Freight website, but I don't know it that is for a pair or each. Either way it is a great way to keep the original look and have new technology.
So far in 5 + years they have been trouble free.