I've looked around at various companies including Fluidyne, CSF, C&R and Mishimoto for an all aluminum radiator for the S55 but it looks like nobody makes them. CSF makes them for the R129 and newer C63 but I am surprised they don't have any for the M113k cars. I went ahead and ordered a Nissen radiator as I have one in my W202 and helped lower operating temps considerably so I'll wait until I find something I would really want instead.