Spark Plug Spanner

Hi I'm trying to get spark plugs out of sprint (Carb model) but can't seem to get a spanner to fit got a 16mm thin wall but that doesn't fit also thinking ahead if I want to change plugs on my 2012 abs 1050 I'm not going to be able to as I haven't a plug spanner that fits.
Can I have some guidance on where I can get spanners from that will fit for both bikes please.

cheers
Bassy

 

So this is what I did. Bought an 18mm spark plug spanner knocked out the link pin between the handle and the socket, bent it slightly and just placed the socket extender between the handle and the socket, I didn't fix it it, it just fitted nicely.

 

Cheers, I found a socket in the end I turned it down on the lathe so it would slide down the barrel.

 

Best is from std tool kit. Sometimes come up on ebay or try ivan at national triumph.