I found 2 different places with these dimensions Lenght: 510 mm, width : 350 mm, height : 520 mm --- i guess that still doesnt help me though
http://www.ebay.ie/itm/60-L-oval-ferment-barrel-SPEIDEL-plastic-fermenter-beverage-drum-22134-/321645114528?pt=LH_DefaultDomain_3&hash=item4ae38af4a0...