New Tyres - Which Rim Locks?

Just ordered a set of MT21s & thought it'd be a good idea to fit a set of rim locks.
Am I correct in assuming 1.60 front & 2.15 rear are the correct size rim locks for the std DR350 rim sizes?

Tyre sizes - 90/90 21 & 120/90 18.

I also just bought some rimlocks, you buy for the size of the rim not the tyre, the size of the rim should be in the handbook or stamped onto the rim itself.
Yer man Timpo advised one for the front and one for the rear.
As far as I know www.racespec.co.uk is the place to get your rimlocks from.

Excellent, thanks.

Yup, the sizes are indeed stamped on the rims.

Just fitted the front rimlock, applied a solution of washing up liquid and water to the rim and the tyre bead, it went back on in minutes, alot easier than I was expecting.
I googled "fitting a tyre rim lock", it came up with a brilliant tutorial, plenty of tips and pictures.
I bought a couple of tyre levers, I found a thin one with a spoon like shape on the end alot easier to use and did'nt damage the rims as much.