Do you have a Ford chassis with a V-10 engine?
Check RockAuto but enter a vehicle that may have the same chassis as you for example a 2001 Ford Excursion. Seems oil cooler lines for that vehicle are readily available.
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 20 years & 200,000+ miles