There were two styles of mounts for the racks - horizontal and vertical - both could be ordered through Isuzu or bought from retailers as "wingrider" mounts. The names came from the bolt position (basically one had bolt holes horizontal to the bar while the other had them vertical - I don't remember if they were named from the bolt position or the item mounted position). I don't think they're available any longer but you might be able to find a set on eBay.
-- John
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