People are offering part number 929501 as the fan part number for the Puma 80 and 80e combi boiler (last made 2001) - Few references to your number.
There's one on e-bay for £154 + £8 postage
They're available from CET for £45 refurb/exchange
And Keep the Heat On for about £113 + VAT + Shipping
Local Plumbing Merchants may have one too.
Peccavi
January 2009