It's almost impossible to recommend a lead or interface on eBay because so many sellers are selling cloned items that have been proven not to work at all or without some internal modification.
As far as I'm aware, the only company selling ones that are guaranteed to work without needing any soldering of wires or modification is Gendan. They sell a set of leads, adaptors and a genuine ELM v1.4 interface as in this link:
http://www.gendan.co.uk/product_FESHW.html#product_information
Or... the complete kit of leads, adaptors, ELM v1.4 interface and the registered version of FES that enables you to connect and use all the functions of FES here:
http://www.gendan.co.uk/product_FESPKG.html
There's also a lot of information about about the leads and what modifications are required to them on Yani's FES forum here:
http://forum.fiatecuscan.net/
As far as I'm aware, the only company selling ones that are guaranteed to work without needing any soldering of wires or modification is Gendan. They sell a set of leads, adaptors and a genuine ELM v1.4 interface as in this link:
http://www.gendan.co.uk/product_FESHW.html#product_information
Or... the complete kit of leads, adaptors, ELM v1.4 interface and the registered version of FES that enables you to connect and use all the functions of FES here:
http://www.gendan.co.uk/product_FESPKG.html
There's also a lot of information about about the leads and what modifications are required to them on Yani's FES forum here:
http://forum.fiatecuscan.net/