Do you have a picture of the new mount ?

I use the same mount on my 1980 and 1983, and on
my old 1980. The 123 part number makes me think
that it probably is correct.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250