Sorry but too find a finishline kit these days you have 2 options
1 contact Mazda importers trougth the world (i belive Europe and maybe Japan was most actual) and ask if they still have a kit on some shelve
2 too check Junkyards (again Europe and Japan) if they have a car with the kit.
The reason why these are so hard too find are that Mazda stopped selling these kits some years ago.
When i bougth my ZKW ligth grille (wich was a part of the Finishline stuff) i was told that it was the last reminding item from their Finishline parts. (no more in Norway

)
Even if the Finishline kits was branded Mazda i
belive Erebuni was the real manufacturer (look at both kits and you will see the similarities)