Spark Plug Socket Size For A R33 Gts-t?

[TUF250]

I bought myself a clean 86,000k r33 gts-t and want to change the plugs. I am using the recommended NGK Platinums (PFR5G-11 from memory)

Anyway, I have pulled the intake piping off, coil cover off, coils out and wanted to know what size the factory plus are? I slid my 16mm (5/16 i think it equates to) onto the new plugs and it fit perfect. It feels a little loose on the plugs that are in there and they seem to be in tight to I want to make sure this is the right size before I go pushing harder

any thoughts would be great

thanks!

[BOOZTJUNKEY]

should be one of the two sizes above are you using a sparkplug spanner or deep socket or just a nomal socket ????

[TUF250]

should be one of the two sizes above are you using a sparkplug spanner or deep socket or just a nomal socket ????

deep socket / spark plug socket (has the rubber boot inside)

well if they are the only two sizes i will push on

thanks