Help with EEC IV serial numbers

[builtPARKtough]

Looking to replace my A9P with an A9L, but I'm not sure which serial number I should be looking for, or if it matters.
For example:
NAPA has an E9ZFAA, F3ZFDA, and F3ZFDB available which are all 5.0, 5 spd, mass air ecu's. Does it matter which one I get?

 

[Jmunk]

What is NAPA going to charge you for the computer ? Ebay would be cheaper I imagine.

 

[builtPARKtough]

$124.00 and I'd have it today. I've looked on Ebay and they don't seem to be that much cheaper not to mention I wouldn't get it for a week.

 

[Mustang5L5]

E9....1989....A9L

the 1993 (F3) computers are slightly more conservative

 

[builtPARKtough]

E9....1989....A9L

the 1993 (F3) computers are slightly more conservative

Exactly what I was looking for, thank you.