Believe me I tried the genuine fluted trim from my local Rover dealer, Minispares and my local motor panel supply company . I have tried lube , running it through a bucket of boiling water prior to attempting to fit it as well as leaving it in the paint oven at work whilst its in use then running the car in to try and fit the stuff........ None of it worked.
The best place to buy it from is Phoenix supplies . They attend most of the major Mini shows , cant miss there stall as they have reels of arch trim , screen rubbers , screen inserts , door seals etc . Sure they have a website.
Everytime I buy some I ask if they get it from there usual supplier , then I know I can...........................
Literally offer it up and push it on , no problems
You cant say that about the other stuff available .
D