1st Step: Check the model number of your current case under the blade (CE0536 or CE0523) 2nd Step: Choose the model that suits you. DID YOU KNOW ? The model of the HU83 or VA2 blade (with or without groove) does not matter if you plan to replace it with your own. 3rd Step: Order the model that suits you suitable, once received nothing could be simpler! You will need a pin punch or a hammer and nail. Follow our assembly video to replace your old case with the new one and you're done! Ideal product to replace a broken/worn case, or with damaged buttons. Electronic circuit and battery not included (they need to be collected from your old case) Note: The data are all manual measurement, please allow 1-3cm error, due to the light difference and display, there will be some color difference, depending on the physical item received.