first, it's an isolation transformer; the game came with a K7000.
second, it IS the transformer that Smash TV came with.
third, Smash TV is a JAMMA game, of course it always used a switching power supply.
last, I already outlined what every single plug is in there last week. you need to crimp .093 pins and use according 3 pin plugs if you want it like original again.
follow the lengths of the wires. the shorter 3 wire set is for the power supply, the longer one running up the side of the cabinet is for the monitor. the 2 pin plug is for the coin door lights, whether it's 5.9V or 6.3V doesn't matter, it's enough to power the #555 lamps. a test to ensure which is the isolated side for the monitor would be to measure the neutral back to the neutral pin of plug (the fatter one) that goes into the wall. if it reads open, that's the isolated side. isolation transformers eliminate neutral running to the monitor, as doing so and connecting earth ground especially will blow the entire diode bridge out.
if you don't know how to crimp molex now would be a good time to learn, unless you want to hack it with wire nuts or something like thousands of people before you have done.