Thanks again for all your helpful feedback, guys

I'd be interested in seeing those custom made ones, Gulfstream. Do they have a brushed steel finish? I don't need any lettering or logos on mine, as I have the GTI seat inserts and any more would start to look OTT. I will remember to clean with alcohol, Gossa. Rick, any chance of a close-up shot of yours?
EDIT: I have just stuck a couple of strips of 3" wide Sellotape along the front sills. Not particularly sexy perhaps, but it's practically invisible, free, renewable and would appear to do what I want.