X dimension is the length between the firewall fitting and the center of the rod hole in the rod. There is also some change to a larger diameter hole on the Astro booster. The X dimension is 6.125 for the Astro booster, and the SyTy vacuum booster's rod an even 7"..

Upload Date	:	Tue Mar 15 16:40:07 2005
Image Size	:	1024 x 768 (223k)