5 speed getrag box will bolt up fine. Blocks are identical. As mentioned (and as is the case with any auto to manual conversion) the auto crank does not have the two flywheel locating dowels like that of a factory manual crank that vs series 2 onwards had standard. The crank can easily be drilled to add these 2 dowels, though many who do the conversion dont worry. Personally though i'd add them just for that little extra security.
The problem with a getrag box behind an L67 is not a weakness of the box itself to handle the torque, but the clutch. If you give it a hard time or slightly work the L67, the dual mass flywheel wont last all too long. The remedy here is to convert the flywheel to a single solid mass billet flywheel like that of the earlier T5's. Many clutch companies make the conversion flywheel. Im running the exedy version in mine.
Jump onto
www.l67torque.com • Index page as its been covered here many times before.
Cheers