I bought a pattern part for mine just under 2 yrs ago from Egay. Cost £35ish I recall and has been fine. I have also read a lot of different posts on here over that time which do not recommend the use of aftermarket AFMs.
Maybe I have been lucky but certainly saved a whole heap of cash compared to LR, and yes, tis a piece of **** to fit, 1 electrical connector, 2 spring clips and a jubilee clip. 5 mins max - and that includes finding the screwdriver.