broken light socket

[Montana_10714]

2011 - Monty 3580rl...
the hanging lights over the island take a 1076 bulb. The one unit has never held the bulb tight - I had to twist it every trip to get it to lite. Replaced the bulb three times in one year. Now the bulb will not stay in the socket - the plastic shell is broken. Does anyone know where I can get a replacement socket ?? Montana customeer service says I have to replace the whole unit.

Thanks