Hello
Anti Size compound is Optimol HT.
Steel lugs are not recommended for winter use on the early tube type Fuchs and the Mahle magnesiums. ( Corroision )
As long in proper tourqe specs there will not be any problem.
The reason for the aluminium lug nuts where the lower stress generatet trough the heat expansion and to save some unsprung wight.
The lug nut´s have M 14 x 1,5 "Kalottenform D". Those are very oversized dimensions. VW used the same lug nuts on ther VW Type 2 Buses. But that tradition startet in the 356 and Porsche was not Colin Chapman.
Lug nuts are dirt cheap compared to some other manufactorers. Just ask for XJ-S HE lug nuts.
Grüsse
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