I use a Yaesu CT-44 adapter that allows the 2 jack connector to work with my VX5R. I bought it because all my older lapel mics have that 2 jack connector.
Then I bought the Sena cable with the 2 jack end.
for the VX7r, check out the yeasu CT-91,
2015 KTM 690 Enduro R
2014 R1200GS - My Naked Street Touring Bike
2000 KTM LC4 640 E - currently up for adoption with 3200 miles