Just went out & ran down the two above-mentioned exhaust donuts today. Simepl donut is Carquest #F20223 and flanged is CQ# F7171. A bit less than factory at $3.40 & $7.12/ea respectively.
Measurements are:
F20223: ID 2.03" OD 2.40" height 0.435"
F7171: ID 1.785" OD 2.41" height (total) 0.660 (flange only) 0.230"
Apologies all measurements in English units my calipers are a bit older.
Pictures of each:
Mr. Ryerson do these match the factory ones you purchased?
Carl
PS Jealous of 930...when I was in 11th grade one of the senior guys' father bought him am 84 930...which he learned to drive a manual transmission on...