Folks, quick question--I'm going to have my spare drivers seat cushion re-built with new horse hair pad and foam boosters. I also have a spare spring base which has the two squarish looking foam blocks installed. I'll let the upholstery guy pick the best base to use. I ordered 2 of the round supplemental foam pieces ( 126 914 22 15) but I see there are actually 4 coil springs in the base; one set close to the front edge, the other slightly back. How many round boosters do I use ? and if only 2 which set of coils get them ?
Thanks,
Peter Weissman