I did use the center left and right rubber donuts. I purchased (2) 3 foot sections of 3/8" x about 3/32" thick plain steel flat bar at ace hardware. 3/8 flat bar fits the rubbers best as these bumpers are flat on the inside, not like the round ones on the rear muffler.

The fellow made a loop in the end of the flat bar for the rubbers on one end of each bar.

Then he supported the exhaust pipe (jumper already in) with one of those tall floor muffler jacks and overlapped the two sections "on top" of the installed short Jumper.

Then he welded it to pipe (both flat bars overlapped on top of exhaust pipe). Then he tacked along the way. So he used 3 feet on each side with over lap in middle.

The whole job took like 30 minutes and I bought the flat bar for $3.50 each.

$7 material, $20 Labor

Hope this helps.

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1982 300SD