17.5" Hijet Propshaft

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Hi,
I'm new to this site, and am hoping someone can help me. I have a 2002 1.3 Hi-Jet efi and the propshaft has recently broken. The garagre I have taken it to specialises in vehicles of this sort and had a propshasft on hand from an older (1999 I believe), 1 litre model which did not fit.
Since then he has contacted several dealers who all state that the propshaft should be 25 or 33 inches. Mine is not. It is only 17.5 inches.
Does anyone know why this may be? Or, more importantly, where I can get a replacement that will fit?
Thanks!