The vibration isolators sold by Van's have always been just one part # used at all 4 locations.
The difference is that you orient the two halves differently depending on whether they are in the top or bottom positions. On the top the isolators are predominately loaded in tension, where on the bottom they are predominately loaded in compression. So the higher durometer (harder) half goes on the rear on the top, and on the front on the bottom.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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