I havent been into the 73 up trucks too much , as far as swapping pcs, but it sure looks like they did something different. A lot of guys are opting to swap complete crossmember assys to avoid the missmatch in parts(not a bad idea ). I did the swap disc in pcs on my 69 (stock crossmember)& converted to 1/2 ton susp at the same time, & sorting out the steer linkage pcs was a bit of a headache. at any rate, good luck........crazyL 
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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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