https://greatplainselectronics.com/
https://www.mouser.com/
https://digikey.com/

Looks like Great plains is sold out couldn't find them on the site. At any rate, for the single sided connectors you need .156 crimp style (do not get trifucon.... the don't work on edge connectors). Get the correct gauged ones (18 or 22) - that way the insulation is gripped correctly (get some of each).

For the double sided connectors sometimes you need bifurcated ones - look at the ones in your connector shell if there is an empty area down the middle it's the bifurcated type. (I'm not sure of the reason these are used sometimes.... maybe the solid ones are 'too solid' when putting them on the edge connector?)

For the pin type connections you can get trifurcon, these offer greater mechanical connection (good for high vibration areas) like your pop bumper driver board connections. AFAIK they are rated the same current capacity though (I'd have thought they were higher since more mating surface, but apparently not).

Most of the connectors are the lower current ones. Don't get gold plated though, dissimilar metals aren't good in connectors. Look at digikey and mouser links from ForceFlow - also other pintailers sell them like marco etc. but sometimes they're pricey.

https://www.greatplainselectronics.com/categories.asp?cat=215

These are NLA, and the remaining stock when it's available is expensive.

$2/each, for example: https://www.marcospecialties.com/pinball-parts/08-03-0304

Only replace those if it's actually necessary.

Maybe I'm stupid but I can find any .156 molex crimp connectors at either Mouser or GPE links above.

Used to buy from here, not in awhile though.
http://www.bigdaddy-enterprises.com/

He doesn't really sell much in the way of parts & components any more. Mostly just replacement boards now.

Pinball Resource: "Tool" section

Molex “F” Crimpers

A Molex Crimper for attaching the pins to the wires. This tools is for Solid State games, especially useful for System/1 & System 80 Gottlieb®, Bally and Williams connectors for G.I & Power !

MOL-WHT1921

$22.00ea

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Planetary Pinball and Marco sells them.

connector pins
https://www.pinballlife.com/156-trifurcon-crimp-terminals.html

Pin removal
Male/Female 4 Pin Molex Power... https://www.amazon.com/dp/B0094MIS9U

Barrel Cremping Tool

IWISS Open Barrel Crimping Tools... https://www.amazon.com/dp/B07G98DLB8

W-HT-1921 (intended for 0.062" and 0.1") and W-HT-1919 (intended for 0.093" and 0.156"):
https://www.greatplainselectronics.com/products.asp?cat=59

Better crimper would be 1026-CT or 1028-CT:
https://www.greatplainselectronics.com/products.asp?cat=80

0.156" connectors and contacts --
Molex Brand connectors and contacts:
https://www.greatplainselectronics.com/products.asp?cat=86

Generic connectors and Molex contacts:
https://www.greatplainselectronics.com/products.asp?cat=81