On most cases the cylinder numbers are stamped or cast onto the intake manifold,over each cylinder. If not call you're local part's jobber the'll want to know the engine size also, they'll know.
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis
Passenger side second cylinder from the front.
One for each cylinder
Number one cylinder would be the first cylinder up front on the passenger side.
On a 1999 Mercury Grand Marquis , 4.6 liter V8 : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
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firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis
On a 2001 Mercury Grand Marquis : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis ( V8 )