Doing a clear out, I found these LEDs in the shed don't know what the are anyone know?

I put beside 501 bulb for scale.

Lolo, it looks like a single contact aftermarket LED bulb of a type similar that some of us have trialled as 'upgrades' for the standard incandescent rear tail/ fog lamps (as a point if interest, when you take the standard rear tail and then rear fog bulbs out of the unit, it is useful to note which one has a dual contact and which one has a single contact).

Thud below thread(s) might hopefully assist:
http://www.fullfatrr.com/forum/topic22712.html?highlight=rear+led