XHP-260 'experimental' engines = stock 1962 Ford 221 pan (which is a different depth than all pans to follow for 260/289/302 engines) based on engine serial number 4 that was analyzed this year
HP260 'production' engines = stock 1963 221/260
oil pan (pans have date codes stamped into them)
260 2V 'production' engines (two Cobras got 260-2V engines) = probably the stock Fairlane pan from Ford
HP289s "five bolt" Ford serial numbered assemblies = 1963-64 Ford 260/289 pans (pans have dates stamped into them)
HP289s "five bolt" Shelby serial numbered assemblies that were fitted with aluminum T10 transmissions = 1965 Ford 289 pans
HP289s "six bolt" Shelby serial numbered assemblies that were fitted with high performance C4 automatic transmissions = 1965 Ford 289 pans