That may have come out of a Bally Freedom. The cage which that transformer is in is different to how Six Million Dollar Man mounts the transformer. I had to re-fit one that someone previously did a poor job retrofitting into a later game. The one I worked on had the rectifier board mounted flat on top of the cage but your cage doesn't have the holes for the rectifier board mounts.

Measure your line voltage at a wall socket and configure accordingly.

See the power module schematic in the manual:
Note, the G.I. 7.3VAC circuit has double wires.

Transformer_Wiring1.png

Transformer lug wire colors:
1 - Red [THICK]
2 - Red (thin)
3 -
6 - White-Red (thin)
8 - Green (thin)
10 - White-Green (thin)
?? - Yellow [THICK], lug depending on line voltage you select

13 - Orange [THICK]
14 - Green [THICK]
15 - White (thin)
16 - White-Black (thin)
17 - Blue [THICK], note double wires to carry higher current load
18 - Black [THICK], note double wires to carry higher current load

Here's pictures of a power module I pulled out today to service.
NOTE: the pictures below show a European wired transformer for 220V

IMG_0016m.jpg
IMG_0022m.jpg
IMG_0001m.jpg

130LA10A is probably factory. When I need to install new I use the xxxLA20A since they can take take larger hits.

The rear screws are #10-32 thread from memory, probably 3/8 to 1/2 inch length.

IMG_0004a.jpg
IMG_0003a.jpg

This should do.
Note, the factory J1 connector was 8-pin. If your kit came with a 9-pin connector, you must leave pin 9 unused.
Two gauges of wire thickness were used, those marked below in large font and drawn with thicker lines represent the thick wires.

RectifierBoard_Connectors9.png