The ones you got from PSP were WMS rubbers that IPB had leftover from their purchase of the Williams parts. They are old leftovers (over 10 years old) from WMS so they may not be the longest lasting rubbers nor the best performing rubbers around. When I saw them I wasn't too keen on the colour so I didn't keep any for any of my machines. I'd say they'd make for a good novelty rubber job on a machine but I wouldn't recommend installing them on a machine that is tough to change out.
Karsten Beck is a distributor of ours and he is a top notch bloke to do business with and is very trust worthy (the main requirement of being one of our distributors i.e. RTBB).
