Here are the specs for that particular cap.
Overall Dimensions 2-1/2"Diam. x 3-5/8"Tall
Body Height 3-1/4"
Microfarad Rating 40/15
Capacitor Voltage 370V AC
Amazon has some that can be shipped quick. It's oval so you'll have to adjust the strap to fit, but that shouldn't be an issue. There should be plenty of room for it.
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!