Does your car have an oil cooler? If so, which part are you looking for? Note, it does come in two parts. The part that bolts to the block is the same as used for a 4.6 SOHC 4.6. The oil cooler part bolts onto this part. There's an O-ring between them. This O-ring frequently leaks. So if the problem is leaking there's a high likely hood that a new O-ring and oil filter adapter gasket will fix you up.
Exactly what is wrong with the part that you have? Because if your car does not have an oil cooler it sure looks like to me that any oil filter adapter from a SOHC 4.6 Romeo could be used.
Try searching on car-part.com which is a searchable list of salvage yards in your area.