The only car that I've seen with all the original VE3 jack equipment still present had the load rest hook attached to the jack mast, as per the standard bumper jack mounting. A sample size of one is no basis for an assumption, but I can't imagine where the load rest hook could be securely mounted on it's own..... Pity, because originals being so hard to find, it's a shame they're hidden under the spare!
IIRC, the standard jack mast mounting is shown in UPC10 of the 69 AIM.