Look here:
https://www.multiecuscan.net/SupportedVehiclesList.aspx
For the 1.3 Multijet for Service Reset no additional adapters are required. Just a genuine (not Chinese rubbish) ELM Interface. I prefer OBDLINK SX interface. If you want to cover all systems then A5 and A6 are also required.
What year is your 500X 1.3 Multijet? I doubt it has an SGW installed, but even if it does then you can get a bypass cable.
Personally I recommend
Gendan for
MES, cables and other diagnostic kit. The other UK approved distributor is
BMDiag. Both are authorised/recommended distributors. Others have bought off eBay and other places with no problems but it can be a lottery.