If you have removed the bodywork from the chassis, you will find a rubber on the edge of the chassis that acts as a seal between the two parts. Don't forget to renew this rubber, as it provides the seal between the two.
Mount the rubber by fixing it in a few places with sealant before mounting the body, otherwise the rubber will slide off the chassis. Before placing the body on top of the floor, drill the holes for the fixing bolts and push the bolts through the chassis into the rubber if possible, making it easier to tighten them later. Fit the bolts by turning them a few turns in the nuts. When all bolts are mounted, you can tighten bolt by bolt crosswise.
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