If my research is correct, there never were any "Factory" luggage rack for any MG, they all were "dealer options" The most commeon one was an american made rack which did start being used sometime around 1974 and does come in many sizes (usually described by the number of slats) I have even seen a 7-8 slat version on a Pontiac Sunbird ( which I was told was a "Dealer option" for those) I have yet to do any research, but if true. might be a source for those ellusive plastic feet and the chrome retainers. The answer to the question is... I don't believe the 6 slat version will fit on the boot lid of a Midget. If it does, it will probably look out of scale.
Before '74 there was a huge mix of different luggage racks. Most looked kind of small on the MGB and Big on the Spridgets. All looked kind of tall for either location.
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Mike