The other LARK GTR is unconfirmed, but should be #04R as there aren't any other possibilities that make sense. In addition, the GTR Racing History included on the poster from "Driving Ambition" shows that #04R replaced #14R in the last race of the '96 Japan GT season.
'M66 MCL' is 14R, confirmed by VIN. I assume that is what you are calling the Monaco car.
Agreed that the entry for 15R needs to be updated.
>8^)
ER