Don't know if it holds true for these mounts, but NORMALLY an even part number is for the right (passenger side) of the vehicle, and odd part number is the left side.
On small block mounts I have seen multiple part numbers as well. When followed by a color (as pictured above) I believe GM sprayed (or brushed.... not sure) the color of paint that was indicated for the correct part number.
I don't think I still have them, but had a pair of sb motor mounts with different numbers followed by "GOLD" and "GREEN". Seems like there was a third color, and it may have been "BLACK". That particular set had green paint on them from the factory.
Yours looks like it has remnants of blue paint.
Sorry, but I can't tell you what mod (if any) was made that took mine from black to green or yours from black to blue.
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Last edited by Lynn; 02-23-2019 at 04:58 PM.
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