Fergus Scott, James Malcolm, Murray McConnell and Gavin Lowe are in the Ayr squad that face Gala at Millbrae on Saturday.
Neil Herron starts and Andrew Davidson is on the bench for Glasgow Hawks who travel to Goldenacre to take on Heriots.
Scrum-half Ali Price starts and Matt Smith is on the bench as Stirling a County take on Boroughmuir at Meggetland.