Improved Alloy flywheel housing for DB2 & 2/4, looks exactly the same as the original from the outside, with rear seal kit included, the only thing needed to fit this to a STD crank is to modify the flywheel.

These can easily be fitted to existing engine installations, full instructions included to do just that, Flyweel machining instructions, if supplied unmachined 

The new flywheel housing has an improved oil drain from the seal to the back of the block, similar to a MkIII - you do have to drill 2 small holes in the block below the crank either side of the bottom web, (but there is enough space for the oil to run back in the slot in the rear cheese)  we have been doing this for years with no problems though.

Shown in the pictures is a fully machined production flywheel housing, Part no. 71709 to fit 2.6ltr & 3 ltr engines with STD cranks (this is the one that uses our seal conversion on the crank),