I bought them from my local tps, dont get them off ebay they charge a lot more, i got all 3 trims for less than £25
Part numbers are
S1K0868039B75R £6.90
S1K3868050C75R £8.43
S1K0867179D75R £8.43
All plus vat, Thats the retail prices though so if you can get stuff on an account from tps will be a bit cheaper
Thats not the lighting switch by the way, i havent replaced that.
I'd check part numbers first though, i dont know if they would be different throughout the range.