As above use the relay numbers given, but don't worry if it doesn't have a 87a, the relay shown and mentioned wrongly is a changeover relay not a double throw at all.
You just need a SPST single pole single throw relay, 40 amp will be more than enough, the 044 locks out at 11.2L/min and 18amps anyway.
Don't foget to run the earth to the battery, this way you know for certain it's got decent feed, some put it down to the body, even underside of car so more corrosion and low voltage can build up!!.
The yellow relays as used on billions of fords would do the job, I put mine on a relay holder just behind the n/s/r seat back at the top, ther eis conveniently a 8mm hole there so bolted holder through here.
That way when you go to a show etc, simply pop relay out and carry with you, makes it a little bit harder for pikeys for no cost.
tabetha