Option 1 - Royal Vendors Merlin 2000, Option 2 - Selectivend/USI/Vend Net with a 12 or 15 Position Coin Changer Socket, Option 3 - Vendo Univendor with 5.1/5.2 Board and Harnessing to Dumb Mech, Option 4 - Vendo Univendor with 5.1/5.2 Board and Custom Harness for Dumb Mech Header