To induce HollyFrontier Refining & Marketing LLC, its successors or assignees (hereinafter referred to as HollyFrontier ) to sell asphalt materials, gasoline, diesel fuel, lubricants, and other petroleum products & related services to ___(company name) of ___ ___(city, st) (hereinafter referred to as Principal ), I hereby guaranty to you the payment of such sum or sums now due and as may at any ti