Hi all, my B544 1990 has riderite air assist suspension airbags by firestone, unfortunately they are quite close to the suspension units and both bags have a groove worn in to the rubber and one has worn through. I can reposition slightly so they are clear but the one which is now punctured is proving very difficult to seal. I have tried puncture repair, chemical sealing and taken it to two well known tyre repair outlets, they have plugged it, patched it etc all to no avail. So new airbag required Anyone know where I could get one of these?