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I've been thinking about converting to LED but haven't got around to it, so I can't comment if those bulbs are any good. I know they make LED flashers so you don't need to ad resistors. The NAPA number is "LIT 285" but you could probably find one online for less.
I used the red 1157 LED's in the rear only of my econoline, left regular bulbs up front they kinda flash fast but work none the less.
However....for a custom touch i used a set of clear lenses on the taillights for a clean custom look and boy with the clear magnifier center of the lens they are wicked bright
...Remember the econoline used the same taillight assemblies as the 57-60 p/u's