Thanks again, nicksaph,
I received the Sapphire arms in the mail yesterday, and compared them to a pair of stock XR4Ti arms. It looks like Scorpio ARB is probably too wide, as well as too long as you noted, to work with the TCAs I received. The rough dimensions of the two arms were comparable. The inner bushing to outer bushing length seemed to be the same. I also have a Merkur Scorpio arm that is much longer than either of the other arms.

One interesting thing I noted; the inner pivot bushing on the Sapphire TCA is bigger than the Merkur XR4Ti bushing. The measured width of the stock Sapphire bushing was 32.22mm, while an XR4Ti Powerflex bushing I have is 30.32mm. The bolt hole was the same size at 10mm. The Merkur Scorpio requires a 12mm bolt, though. I looked in the Burton Power catalog and they did not have a separate listing for the Scorpio/Granada inner bushing. They claim it is the same one as the Sapphire/Sierra Cosworth (et al). Is the Burton catalog just not specific enough, or incorrect?