Barry, go to spares2go.com [ www.spares2go.co.uk/browse/a701/Chef/KENWOOD/m138/p571.htm ] and look up bowl on parts listing - I did for another part earlier - cool site! I presume you've "lost" your pyrex bowl - only plastic or stainless available it seems - send them an email and ask.
Cheers.
Nige G., September 2006