You can use a regular conversion kit If you have an Apex or Apex HD. You can use a dead cat conversion kit if you have an Apex DC or Apex LR.
The full conversion kits contain everything you need to convert your Apex frame to the new EVO format. This includes top, upper and lower main plates, as well as the new camera mount and any required hardware. Also included is a new GoPro mount, rear antenna mount, Tracer antenna mount, mylar isolation sheet, injection moulded plastics, replacement lipo pad and an additional lipo strap.
The barebones kits contain just the minimum required to update your frame to the new EVO format.