Anyone have access to the part# (and a dealer) that sells the I2 Phone/Tablet holder and screw.  I've found sources online with the I1 and other white ones which appear to be identical, but wanted to see if I could replace and match the existing color (grey/charcoal).  

Have you asked for DJI support? If they have the parts, they will certainly distribute to their authorised dealers and repairers. If they don't have the parts, that is probably why you can't find it so far.

We recommend to find local store to see if they have this part in stock: http://www.dji.com/where-to-buy