Date registered: Jun 2011
Vehicle: 1979 450slc 5.0 (#1094), 1978 280slc, 1989 560sl, 1969 Jaguar E-Type
Location: Northern California
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Preliminarily, it appears that the W126 aluminum radiator will be a serviceable fit into my 107. The one I have came from a 1988 560SEL, courtesy of Pick-N-Pull for $50. It is clean and undamaged.
The dimensions for the stock 107 radiator, including the oil cooler, are 27 5/8" wide and 20 1/2" tall. The width excludes the rubber side mounts that slot into the receiver on the 107 frame.
The 126 radiator is slightly narrower and taller, at 27 1/4" wide and 22" tall. The radiator core is 1" taller than the 107 unit, and the lower tank is 1/2" taller, accounting for the difference.
The transmission fluid cooler fittings are in a similar location, and are the same thread size. The lower radiator hose fittings are in the same place and are of the same size as the 107. The upper radiator hose on the 126 is more centrally located than on the 107, will require routing the hose in the other direction. The 107 fan shroud appears that it will fit on the 126 radiator, the holes on the shroud match up with the 1/2 metal flange on the 126 radiator, some self tapping screws should do the trick.
The only thing that remains unknown is how the shroud will fit on the 126 radiator in alignment with the engine fan. The 126 radiator will sit slightly lower than the 107, but because the upper tanks are the same dimension, it should be OK, I expect. I will need to fashion some small L brackets to hold the 126 radiator from underneath, with some rubber mounts between. Also, some rubber mounts will be needed on the side, because the 126 radiator is slightly narrower. I am thinking that some rubber stoppers mounted to the 107 frame should suffice. When I actually perform the install, I will update on results! Here is a picture that shows the 2 radiators side by side.