The complete ABS cable harness (was P/N:51769572 - CABLE HARNESS cost £93.31 back in 2012). Could be a pig to fit but if it is your only option price is fairly reasonable. CAUTION/NOTE: ALWAYS get your dealer/agent to check and order parts based on your full chassis number. NEVER trust numbers listed/quoted to you by others as they could be wrong and you could end up buying the wrong item!
Unfortunately both the Croma eLearn worshop manual and the
ePER Parts Catalog don't list the harness sub components.
eLearn does have:
K070 LEFT FRONT WHEEL SENSOR FOR ABS
K071 RIGHT FRONT WHEEL SENSOR FOR ABS
K075 LEFT REAR WHEEL SENSOR FOR ABS
K076 RIGHT REAR WHEEL SENSOR FOR ABS
information which is just pin numbers & wire sizes & colours but not the shell or contact details.
In the old Microfiche parts days the connector shell & contact P/Ns were listed.
Try calling you Fiat Dealer. They have access to Fiat Parts Technical Support etc. and they probably do have the connector details and P/Ns.