Wrong bellhousing or do I need a spacer?

Hey Guys, A while ago I got a new Mcleod SFI bellhousing from D&D Performance for my T-56. Well I am finally getting around to installing it, and the new one is about an inch shorter than the one that was in there. From the Mcleod website it looks like I am going to need a spacer, but I am not sure which one. I figure I will just call D&D on Monday, but does anyone know what spacer I am going to need?
Thanks

Here is the Mcleod Bellhousing application site:
http://www.mcleodind.com/application_guide_pgs/MODULAR_BELL_HOUSING.html

Here is what the old one looks like compared to the new one.

Thanks for the info guys