Seat webbing / diaphram replacement

Hi There

I am just about to refit my plus 2s seats and would like to replace or reinforce the black rubber diaphram under the seats which is looking worse for wear. CN says that the part is unobtainable, so what is the best way to go with this job? I have seen Pirelli webbing advertised, but am unsure about the best way to secure it.

Any suggestions apprecaited.

Many thanks

Berni

I’ve used high density half inch foam sheeting, designed for cold temp camping bedding, cut with scissors to fit between the springs and vinyl. Soft, lightweight, comfortable.