I am not familiar with the terms LS or JOD, but we know how many minor Regular Wheel casting changes we have updated to Nick's listings that are visible, but were missed by the detailist Mike Stannard while compiling his 1985 Matchbox Guide.
I believe you are spot-on with suggesting Bronner may have influenced the decision to add updated Gift Sets in 1965 such as the G3 Vacation Set you have mentioned earlier, the older Gift Sets needed updating with "Fresh" models by that time. On our side The catalog stores like Sears, JC Penny and Montgomery/ Jefferson Ward did well during the Holidays with Lesney Gift Set sales, so the demand was there for Bronner to answer with fresh merchandise to import and distribute to them on the East Coast.
I can't argue with your doing some added research on the T Birds imported into the U.K. having U.K. luggage racks fitted to them, so I will look through some U.S. literature on the 1958-1960 models and any option that Ford may have offered for those cars.
I love your display case full of Lesneys, it is a type we only saw while shopping in Canada. Bronner offered U.K. wooden cases VERY early on in the sixties, but the free ones we saw in the U.S. stores were his own cardboard types which began in the mid fifties. I would place that T Bird in the #75 place if it were mine........

Kwakers