Okay, i should clarify. I was told i could USE later brackets, by modifying them to mount the bumper closer (filing some slots, drilling holes or something). What i want to know is if the later brackets themselves are heavier than earlier ones. I'll hold out for earlier brackets if the later ones are 10lbs heavier. Weight reduction is a big theme here... especially up front.

What year was the bar added to the bumpers? Was a 71 heavier than a 70 bumper?