The 2749501 is a GY9.5 lampholder to suit a Minim - then the strand factory number was TS/OC28537 for the Lampholder & Mounting Plate. We have 2 in stock in Melbourne.
The SL/OD29910 is a Lampholder Slide Assembly
to suit Cantata Profiles, F & PC - GX9.5 lamp base(Old part no. 2762804)We have 4 in stock in Melbourne....