Eureka! Thanks, Ray, your diagram guided me to the right area. They go on the bottom left and right sides of the radiator bottom tank flange (parts#136), sealing against the bottom cover (which I've had off the car for awhile). I'm putting them back with contact cement.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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