The buttons on my key fob need to be pressed harder recently to open / close the car. Can I just buy a new case from the dealers and transfer the internals from mine?

Also I like the look of the MK3 key. Are these an easy swop?

Sent from my Samsung Galaxy S7

I'm assuming you mean the remote locking function?

 

If the button mechanism is going wrong it's either the internal parts or the keypad itself

 

If it's the internals then swapping them into a new shell won't help

 

If it's the keypad then you can get replacement pads, I bought some because mine were looking tat and they're a very good fit and finish, look totally OEM:

 

http://www.ebay.co.uk/itm/322114786872