Marcos,
I have FHP 1187 (the earlier version), and it has the dates it was in-service on the back of it, just like several others I have. The correct plate for yours is definitely the earlier one, but I can double-check the dates, if you want.
If your car came out of service late, it certainly could have had the later plates. 1987 isn't a definite switchover, and FHP didn't necessarily pull their plates immediately when a different version came out (I saw cars with different version running around in the '90s).
Go with what you like.
