Intel® DB W-AC 7260 adapter size and antennas

Hi, about Intel® Dual Band Wireless-AC 7260 is it compatible with Notebook Aspire R7 ?

Are there two sizes ? Because then which one match?

And what about internal antennas, do they come with the package?

The Aspire R7 already have a main and aux internal antenna, but because the device has certain WiFi problem with the pre-installed 802.11n adapter, it might be worth getting the correct antennas with the Intel® Dual Band Wireless-AC 7260.