Or, do I need one specifically FOR DAK, as well as the model of pistol in question? Thanks.

The E2 grip kits are different. For example, the P226 DAK E2 grip kit has a differnt strut and grip, no DA/SA cut out on the grip.

The DA/SA grip kit also includes the decocking lever.

The grips are different for each model too, P220, P229 and P226 are not the same.

Gracias, Sir.