This foam set is for both seats. Originally the side bolsters were made from a moulded chip foam which in the 1960's was new technology. However over the years this technology was not that good in that the glue holding the chips together came apart and consequently these moulded items disintegrated and you will probably find foam chips under your seat if they haven't been changed in the meantime. The kit we have developed from more modern foams needs to be sculptured around the frame. The centre sections are quite straight forward but we would suggest you contact a professional trimmer to help you fit these and the seat covers. We will be pleased to offer advice as well.