cobra intake numbers....and a few questions...

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I have a cobra intake and am wondering what year it is off of.

Here are the #s on the upper and lower:


heres the numbers i found at the front of the cobra intake

RF-F87E-9K461BA

THERES ANOTHER NUMBER THAT SAYS 3636 NEXT TO IT.

THE UPPER MANIFOLD READS AS FOLLOWS

RF-F3ZE-9425-A16A

WITH THIS NUMBER UNDER THAT NUMBER BUT MUCH SMALLER CASTING

041621


Any ideas what year this thing is?

Also i am going to stick this on my stock 91 lx coupe. Any idea what the upper and lower gasket kit numbers are? Also does anyone have any recommendations or suggestions on installation of a cobra upper and lower on stock heads?

Thanks in advance.