Lots of kits QR to 12mm but not the other way round!

You want to run QR and your wheel is set up 12mm?
If so you just need the end caps.

As in the ones that come with your front in the packet?

You want the one in the pic

If your frame is qr you’ll just need the end caps as above, however have you considered going 10mm qr, this will fit in standard qr drop outs and will give a little extra stiffness over a normal qr.

Got a set of rear evo qr end caps for £7.50 posted

Fronts will not fit. Bearing id is larger on the front than the rear. Front needs to be able to accept a 20mm axle where the max rear is 12mm.

Pridds new or used? Where are you

Used and in the lakes

Hora
I’ve got a brand new set here, even still got all the blue grease on them
One has a tiny nick from when I took it off the new wheels but won’t see when installed
£7 50 and if your quick I can post out this afternoon