I'll get the info this week about V10's within the last few months and I'll double check my comment of availability. I know we have replaced V10's and may be assuming it is Ford. I have a close friend that is parts manager I will check with and our fleet parts manager as well!
Confirmed, we have actually replaced 8 in the last year! High mileage, abuse, ect... Fairview Ford in San Bernardino is our source but try Capistrano Ford in San Juan Capistrano it's a little closer. Talk to Tom In parts.