I have a set of 87 Vanagon seats out of a wolf..... that I will be
re-upholstering.

Would like to add a "pump up - inflatable" lumbar support to the drivers
seat.

I know Recaro makes one ........

Has anyone done this or knows where part/kit could be purchased?

Any other modification suggestions for the project?

Sorry ....... but all urinal, pottie, ejection, vibrators and rocket
launcher suggestions will be politely deleted.