looking for a replacement contact strip for edirol pcr 50 keyboard

hi, i was wondering if someone here is an owner/ex-owner of an edirol pcr 30/50/80 midi keyboard who might sell me its parts, it was a cheap crap whose bubble contact strips deteriorated with time, the keys have either stopped working completely or the velocity response got fucked. i couldn't get any help from roland directly

i've managed to find a website that sells those but they only had 2 of and haven't restocked them since i had ordered them, i need 4.

it looks like this :

alternatively, any help pointing to a place that might sell those is welcome too.