Welcome to the "madness"! the 70 12 bolt should accept the 71-72 axles......also i beleive the 73 up axles will fit. 67-69 the housings were about 1 1/2" narrower, so they would require an aftermarket axle. Good luck....crazy AL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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