63 dart wiper motor release cam #2421845

I'm looking at the Packages. pdf. 42/46
On Page PK-42 of the 1963 Passenger Car Parts Catalog. Under Code 23-67-2, part no. 2421 845 Cam Package
Windshield Wiper
Motor Parking
This is on the jholster/packages.pdf, not the electrical one.
Google search indicated that Collectors Auto Supply carries it for $34. Sorry, if we're confusing each other. Is Collectors Auto Supply the only source for the 63 Dart/ Valiant 2 speed wiper motor parts?