parts help please

[elchies]

i phoned the dealers for a speedo sensor thay said it would be £55+vat
but i saw them on ebay for under £20
but there is loads of them how would i know whitch one i need
my van is

citroen berlingo
mulispace
forte  hdi
diesel

2002

thanks for any help

[Johny555]

Had same prob with my old combo van bought one off eBay cheap,lasted a WK,they sent me another one lasted a WK,ended up getting one from Vauxhall,£60,ones off eBay £10.so sometimes better of spending that bit extra and getting the OE one,luckily I could fit it my self,otherwise I would be paying £50 a time to have it fitted