C Spanner for hot tuning coilovers

Hi does anyone know which size C spanner is needed for the hot tuning coilovers?

Is it a 1.9 or a 2.25?

Thanks

Ian

The opening is 80mm

I need another as I bent the new one I got trying to adjust my old seized coilovers! They seem to be made of cardboard!

You can get the same style but more robust, dairy spanners as used in most dairies