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I think the blue would work better if it worked at all
The belt tensioner might be prone to hitting another pulley because of the direction of tensioning pull. Most tensioners pull at a right angle to the belt and if you lessen that angle you might be pulling the belt tighter than you think.
Just my $.02
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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