Marcos buys flipper rebuild kits and many more items from Pinball Life and Pinball Resource and marks them up. Look up the pin on ipdb (see the link in the Pinside listing) to see what type of post caps were on the game originally. Why replace all of the coil sleeves? Inspect, clean and reuse. If they are damaged or binding replace individual sleeves.

Personally I would change all the coil sleeves. Dont cost much and you are good to go for a while. I also count 11 based on ipdb. Go with what you count since you have the game.

Marco is just more expensive.

I usually to go PBResource for rebuilt kits/parts.

They're old, but not original. They originally had plastic screw caps.

The idea behind the rubber post caps is that they would pop off if the plastic got hit hard, thus saving the plastic from breaking, rather than having the plastic take a full hit when screwed down and then end up breaking. This was before plastics protectors became common.

Did you count the knocker in the backbox and trough kicker under the apron?

The flyer showed the plastic screw caps.

Plastic protectors are better, and if those aren't available for a particular game, I usually go with plastic washers.