How to? Well, I guess you should probably ask first. They might get creeped out if you just start going at it without giving them fair warming.
As far as common, does it really matter? You two are into what you're into. As long as you can find someone else to help fulfill your fantasy without too much hassle, I don't see why common or not matters.
If this couple doesn't want to play along, I'd check for local swinging couples and let them know what you're looking for. I'm sure you can find several that would be willing to take turns riding in the front and back seats.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." - B. Franklin
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