I would be pretty sure that as you bought on the group buy they would be 1.9" coilovers.
1.9"= 48.26mm
2.25"= 57.15mm
I have Gaz 1.9" coilovers and the locking ring diameter is 63mm.
If you lift out the upper spring platform(has a slot in it) and turn it upside down you can measure the diameter that locates against the inner of the spring,this will tell you if you have 1.9 or 2.25 coilovers.
I think its likely also that the C spanner i linked to will fit both.
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