Unless you were to check the kernel source and compile the modules from
there, I do not know of any other way. If the kernel source in SLES 11
does not have that code, then you may need to compile from another version
of the source, though all of this is pretty risky for an enterprise
distribution since the focus there is on stability more than the ability
to tweak everything in untested ways via custom compilation.

If they are on SLES 11 SP2, I presume they are out of support and
no-longer receiving official patches/maintenance. Perhaps they could
setup a SLES 12 SP2 box to test things out and see if it is worth their
while to get a new subscription. Updates will only work for sixty (or is
it ninety?) days, but they're already used to not having updates regularly
it would seem.

Another option may be to go with openSUSE Leap (42.1, or 42.2 as of
tomorrow) which is based on the SLE 12 codebase and while not mean to be
used in the enterprise long-term, it is still based on that same stable
base. The lifecycle of Leap is shorter than SLE, so if they opted for
this long-term they'd potentially be changing out boxes more-often to stay
current.

--
Good luck.

If you find this post helpful and are logged into the web interface,
show your appreciation and click on the star below...