New macpro needs to connect with thunderbolt Getting new macpro. Have RAID external drive. I am unsure of the name of the connector but suspect it is thunderbolt not 3. 
I want to buy the correct connector so the data on the drive is available. 
Please point me in the right direction. 

Thanks!
Welcome to the forums!

The picture makes it out to look like it could be be both USB-C as thunderbolt would be square. 

Here is a link where you can read on apple’s thunderbolt 3 and at the bottom of the article are easy to compare images of what many apple device adapters female ends look like. Go take a look on the site rather than uploading another clear image.