Fan Shroud for after market radiator

Hey guys, planning on getting some work done during spring break on the '73 dart sport. bot it with the 360 & 727 in it. does not have a stock radiator in it (i think). the square part of the radiator is 22x22 and the fan is approx 18. trying to find one on line b/c my dad is making get one to be safe. what is the best way to look or find something that will fit. i think the bolt holes on the radiator are approx 24.5 apart.

any help would be great.