Gents I found the perfect matching material and it's located in the UK - the outfit will cut to size and it is VERY reasonably priced (loads cheaper than the German outfit above). I ordered 10 rolls so they can definitely do this sizing. Ask for Sophie.
Link here:
http://www.ebay.co.uk/itm/NEOPRENE-S...3#ht_294wt_904
Pictures next to the OEM foam (note the colour is actually a perfect match also (when I compared it to a brand new airbox) - slightly off here as it's compared to an used airbox.
