The pictures were taken at Road America last weekend. This is a ? Jackpiner Enduro and owned by Mark Wessels of Wisconsin. This one I think was $3300 or $3600.
(http://i957.photobucket.com/albums/ae59/CheneySachs/RoadAmerica257.jpg)
(http://i957.photobucket.com/albums/ae59/CheneySachs/RoadAmerica258.jpg)
Thanks for posting! I assume 72/73.