On Wed, Jun 13, 2018 at 11:16:55PM -0700, Alice Wonder wrote:
You might be able to pay Red Hat for an Extended Update Support release of RHEL7 that has a similar version (kernel-3.10.0-514.51.1.el7) but support ends November 30 2018.
The src.rpm for that kernel is probably available somewhere.
I'm fairly certain you cannot download the SRPM for EUS kernels. You might if you're a Red Hat customer paying for that product (but don't take my word for it).
EUS 7.3.x support is going away soon enough that the real answer is to plan to migrate to supported RHEL/CentOS kernels.