If you want a more permanent solution to the broken headlight reflector adjuster issue then take look at the following thread where there is a group buy currently going on (go to post #93 onwards in that thread for group buy details)...
Alfa145.com - Reflector Adjusters In Teflon Material
Well worth the investment IMO and a permanent fix to this very common issue.
The problem with replacement second-hand headlights is that unfortunately they are just going to end up the same way due to one of many bad decisions by the Alfa designers to use plastic that ends up going very brittle with age so if you use second-hand lights then it's quite likely you would end up having to replace them again before next years MOT.
I won't be posting on this forum any more. If you want to know why and/or you want answers to some 145/146 related questions then please feel free to pop over to and post on the alfa145.com
forum where you will find me with the same member name.
I have now disabled all my private messaging options on here but you can PM me over on the alfa145.com
forum if you need to.