Foam to match RIB Neptune bed

[j4ckb]

Hi, I’ve got two single non-sliding Rib Neptune seats/beds which have a 50cm or so gap between them in the van. I’d like to buy/make a long cushion and base to fill in the gap when made into beds so that we have a double rather than two singles.

Does anyone know what density foam would match the Rib cushions (it’s really firm, but I want to match it so we don’t end up in the middle of the bed each night). Or are there are any suppliers who could help?

Thanks!