No. That's correct. The nickel side was sometimes equipped with a Teeter-Totter that alternately allowed the nickel to hit the coin switch or not. This way, both the nickel switch as well as the dime switch were wired to give one game (starts instantly), while the Quarter switch could be adjusted for like 2 to 5 credits.

The mechs are not really "adjustable" but rather designed for specific coins. So, you are actually looking for 3 different coin mechs or "Slug rejectors" as they used to be known.

As for That type Williams door, you are also in need of a metal plate that is shaped like a "T". They are pictured there on that decal with the red print. They screw to the mech and allow it to hold on by the spring metal clip it slides into. Additionally, unlike most coin mechs with a screw stud or peg that measures around an 1/8", the Williams mechs were held in at the door side with 2 very long pegs that looked like spikes. The shorter pegs may work but the mechs may also fall to the side if the door is kicked.

I also believe that your white plastic cams with the coin "whisker" may be set to use the wrong peg sticking out. Please refer to the attached photo of a working door. The nickel side may actually use that alternate position. There is a write up about it in the old Williams parts catalogs but I don't have one at hand to reference.

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No, not specific to Williams, just the way (or hardware) Williams choose to use to mount them (the T plate and the longer pegs). It sounds like you are fully capable of fabricating something to work. As long as you have something to go by.

Coin mechs are just standard 3" X 5" style. You will see plenty for sale on Ebay. Unfortunately, the Dime and Nickel ones are hard to come by since I do not believe anyone makes them any longer. 25 cent US Quarter (or Canadian missing the magnet) are very common and still made in various forms. For your game to be somewhat original, you are looking for the all metal style which are usually pretty shinny Chrome and/or brass parts.

With some adjustment, or leaving certain parts out, you can also use 0.900" and 0.984" token mechs which are smaller or larger than a quarter. But it shouldn't be hard to find an original 25 cent mech. It will be the other two that will require a search or a fat wallet! LOL.

Back to the Nickel alternating lever/toggle. It was probably standard on the coin door but may have been locked in place if your game supported the alternating feature via a stepper unit (electrical instead of mechanical 2 for X plays). I can't remember if that small wire you show in your photo was a small spring (to insure it sat in one position or the other), or if it was the thing used to lock it out of the way. If the toggle was used, the coin whisker would have occupied that other window in the metal (lower right) instead of the standard one you see my coin whisker in.

Would have loved to have found that game on location when I was a kid (1 play a nickel). Pricing was at a Dime a play, 3 for a quarter but soon gave way to 2 plays for a quarter in most locations except where the operator was too lazy or cheap to raise the pricing (or prevented by the location owner). In all my exploration as a kid on a bike in the early 70's, I only found one game for a nickel a play. That was an Egg Head and it was barely worth the nickel in my opinion!!!! The only other game that was typically a nickel were those US Marshall games that shot the small steel balls at the windows of a saloon and jail.