The cost of getting these sensors painted is quite high, I fitted front end sensors to my car and bought a genuine "2 pack" set of spray cans from, in my case Audi - that worked very well.
The official cost of these sensors is also shocking when bought from VW Group dealerships - same for the ABS sensors if you ever need to pay for one!
I took a gamble and bought an extra sensor, genuine part, as they were quite cheap when compared with the dealership, and painted it at the same time to keep as spare - just in case!
Edit:- I thought that I had posted this back in Thursday - but I hadn't!
I got access to an online listing of VW Group car parts, so it was easy for me to check for part numbers and superseded part numbers, so ended up either buying NOS or stock from a dealership that was closing down, it did
help that my car was at that time maybe 4 years old, although having said that, VW Group, like all other car manufacturers, tend to keep parts as standard/common across their models and marques as possible.