Verified in 5.7.2.0.20170321181409_349f1b1. t2.2xlarge and r4 flavors are in "Instance Type" dropdown.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2017:0898