The Scatter shield I have is for a Chevy. I have a big flywheel and compared to a 621 bell housing it looks short. I bought a spacer and had to modified it to fit. I'm not sure on the size of the spacer. There is a 1968 Car Craft article discussing scatter shields and listed Ansen having multiple models.
My user name is correct for a 65 Mustang I have that this scatter shield is going on. It is a vintage gasser.
Thanks