This response is from the R&D team at Team Great Britain and pertains to the Cervelo T4.  It should also fit other bikes as well - the T4 has enlarged chain stays which are the biggest issue.

This is the part we use in 108mm

Truvativ Giga Pipe Team SL BB ISIS

Be sure to install LEFT (non-drive) cup first on a T4 to get clearance from the chain stay.