Does the 37 Buick have the formed spring pockets in the Frame, We have a 36 Olds and 37 pontiac in the barn . both have the bump outs. the 36 pontiac uses the chevy Knee action suspension and straigh frame rails. You might have to trim the frame and add outside boxing plates .. Keeping the stock frame will keep all the attachments you need for bumpers, radiator support etc. There are quite a few picts of Jag installiations on the HAMB. trucks, cars, even a 56 Buick. We have 4 jag fronts and rears in the shop but there will be no time this year, !/4 mile of farm pipeline and a new pump to install and a duplex we are building. need to get a roof done before the Snow.