RetroArch MAME 2014 (0.159) Roms/CHD Section?

Was wondering if there was a way to get the RetroArch MAME Cores available in the DL Area? Or is it being looked into already? Seems like that is the only recent Core of MAME that Loads besides MAME 2003 (0.78) There are 2 possible Sets, but Archive has a 265.1GB Sized DL for 0.159 . There is another one from Emuparadise that is the 0.161 Set which is 51.2GB in Size.

I guess you mean the libretro MAME cores.
Just get Mame Rollback ROMs and CHDs (if you want those) from Pleasuredome or Archive.org and rebuild the Reference sets using the Mame dat-files on http://www.progettosnaps.net/dats/

Mame 2000 = 0.37b5
Mame 2003 = 0.78
Mame 2010 = 0.139
Mame 2014 = 0.159
Mame 2016 = 0.174