iPad Air Screw Sets Nowhere to be found

I was curious of 2 things:

1.) Does anyone know if the 4 LCD screws that secure the LCD to the housing are interchangable between iPad models? For example will 2/3/4 screws work in the Air?

2.) Does anyone know of a supplier that sells screw sets for the iPad Air? I have tried every vendor I can think of including: alibaba, eBay, and Amazon to no avail...

Thank you so very much!