'68 318/727 vs 340/727 trans mounts

Ok, was just wondering. could be a "rock auto" glitch...on their site, there are two different style Trans. mounts for a '68 Barracuda with a 727 auto. The 340's are a spool (looking) rubber mount, while the 318's are a square chunk with a single stud.
Just went back to rock auto site to make sure "old timers" wasn't kick'n in again...Yes... '68 Heavy Duty Package auto. Trans mount is a "spool" type.