MAME 0.261 working core retroarch

Hi all  new to this so hoping im posting in the right place. ive recently got hold of MAME 0.261 ROMs (non-merged) and i need to know what libretro core i need to work with it can anyone help pls

Arcade (MAME) is the recent 0.261 core, the MAME 2K cores are for older versions.