turn my hard drive in a bootable external

Hi there,

I have receiving just found out that i need to replace my logic board in my Macbook Air (original). This is expensive, therefore, i want to turn the hard drive into an external. so that i can boot my data from my macbook pro..

i have the device to do this for my external from my macbook pro, but i have been told the hard-drive for the Macbook Air is different, therefore, the deveice does not work for the hard drive from the macbook air. Please could you inform me in which accessory i need to buy?

Many Thanks

Kind Regards,

Arran