Should be this one for your country US:

https://www.greatplainselectronics.com/proddetail.asp?prod=V130LA20AP

You still would need a fuseholder (panel mount) and a fuse:

http://www.marcospecialties.com/pinball-parts/FHPM

Could also be, that you need a cable entry with strain relief, something like this:

https://cdn-1.us.xmsymphony.com/eedde3b9e7b005007d1cf429fd96e65d/contents/ITC182150/l_lm901001.jpg

In a hurry I found this photo:

http://www.austinthompson.org/Arcade/StarTrekTheNextGeneration/Pictures/SttngCabinetInside.jpg

PS.:
Your actual installation is criminal dangerous, do not let your children grab through the coin door!!!!!!!

VERY VERY IMPORTANT!!!!!
VERY VERY IMPORTANT!!!!!

I think, your varistor and the NTC are wired wrong.

The NTC (BLACK part with imprint STM CL-30) has to be soldered in SERIES with the fuse holder and the line filter.

The Varistor/MOV (RED part) has to be soldered in PARALELL between the input of the line filter.

I hope, you read this post before you start your machine.

The NTC can beome very hot, so take care, that it does not touch a cable inside the box and the wires have to be isolated.

Good luck man!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

NTC correct (resized).jpg

Attention - DANGER TO LIFE !!!

You should no longer try it yourself, if you are not an electrician.

If it tingles on grounded parts, it gets serious.

In case of mistakes BEHIND the transformer, you put the pinball machine in ashes at worst case, in case of mistakes IN FRONT OF transformer yourself.

You have somwhere a loose connection in your line cord plug or your wall outlet, that makes a connection to earth.

Switch off your house fuse and first check your line cord and your wall outlet - better let it do an elcetrician!!!!!!!!

Fotos would help!!!

How is your machine connected, to a power outlet strip???

I do not see any problems, but the thermistor and varistor are not integrated and have to be added separately.

By the way: I hate it, when a seller does not provide datasheets. I cannot see any datasheet for the Marco-Parts.

Attached is a datasheet for a similar part and you can see the schematic of such a part - only for your interest. ...

Look, how cheap these parts are here in germany, and this is even a good 10A part:

https://www.voelkner.de/products/476711/Schaffner-Netzfilter-mit-Kaltgeraetebuchse-250-V-AC-10A-0.225-mH-B-x-H-48mm-x-22.5mm-FN-9222-10-06-1St..html

Schaffner Netzfilter.pdf

1.) because thats botch
2.) safety reasons
3.) replacement cord is not expensive
4.) replacing the cord takes less time than soldering, isolating etc.
5.) looks ugly

Just my few cents ....

As it is not much work, it is a good idea.

Look at my grafic here:

https://pinside.com/pinball/forum/topic/dragon-systen-1-help-needed-adding-fuses-to-small-transformer-mod-#post-4716567

In the grafic, it is a system 1, but it is same for system 80. Look for the correct varistor value for your country. NTC can become very hot, so it must be installed in a position, where nothing can burn!!! CAUTION, you work on the high voltage side!!!!!

I do not know the english word, in german it is "Lüsterklemme". It is a connector you see in the following picture. Important is, that it is of ceramic or porcelain. If you see the part, you at once know, what I mean.

In my sys 1 machines I screw this part to the cabinet and then connect the NTC. The lead of the NTC I put through BOTH srews - but pictures say more than words, so please see the picture.

Always be aware, that the old Gottiebs are imho dangerous inside the cabinet concerning safety. There is no good isolation of nearly all HOT mains wires. I never would allow my my children and my guest, to touch anything inside the cabinet. From the elctric point of view from today, it is criminal dangerous, only my few cents.

Hope, the picture helps you.

Varistor is easier to install, you can simpy solder it the the input of the line filter.

NTC Ceramic Connector Sys1 trafoboard (resized).png