I know MVVS are planing a water cooled version of the 58, any idea how it is coming along.
I would really like to know what size and shape the radiator will be and if the water is pumped.

The engine is available already. Radiator (in radiator kit 3370) size is 145 x 110 x 25 (mm), not including the two 10mm dia, and 10mm long hose stacks, which are 72mm apart and perpendicular to the radiator body. Cooling air passage dimensions are 100mm x 110mm.

Edit:
The pump is part of the motor, The radiator kit is optional.

edit 2, a picture tells a 1000 words, so I share my looking at it. It realy is a piece of aluminum art, and extremely light. see [link=http://www.mvvs.nl/MVVS/main_bestanden/petrol.htm]my website[/link] for further data