Just to add a little more to these. I replaced the complete tail light units 2 yrs ago, the spring contacts are different from stock. For some reason the soldered ends of the LED’s allowed one of the spring contacts to slip off causing a ground blowing the flasher fuse.
A fix was to do a little bending of the spring contacts to be better centered with needle nose pliers and carefully with a drill make a detent in the solder of each contact of the bulb. Careful being the key word here..In my mind problem solved in a very tight area.
For a change a fellow/friend on the HAMB gave me a set of Lee taillight lenses. First custom part on my car. They are much brighter than they show especially the brake/turn lights
56 Vic, B'Ville 200 MPH Club Member, So Cal.