Core values? Or just taking up space-

Are these worth anything?

I need a booster core to return to Rock Auto. Need a 68 style with the tear drop arm

Looks like he has two 1969 Bendix boosters and one 1970 Bendix booster. If you can use those for the Rock Auto core so be it. The 1968 model year used nothing but Midland boosters.

Power Brake Booster Exchange charged me $150 for the push rod for my rebuild because I didnt have it.

I know WCCC offered some rebuild parts for Midland boosters but is there a complete kit available?

The 1970 core looks a bit rusted for a core, maybe??? But I need the 70 push rod to convert my 69 to 70 if you are interested, contact me if you are.

The other two are worth money as cores or sell as is.
The master cylinders are worth something if they are the correct Bendix ones.

I was getting $100/core for each one I pulled from a parts car. Much less if it was pitted. Not sure if they’re bringing that now.

I have been dragging these around for ever- just to have a core on hand, But I don’t think I need them all. I will be glad to work who ever can use one. I’m sure shipping will be a pain. I will trade, for a 1967 manual trans,power brake pedal preferably but I know I can cut down an auto pedal. How can I verify the master cylinders? Is there a part number some where, or brand symbol?
Edit- I bought a 1967 power brake pedal to modify-

I have a 70 core, if anyone needs.

In regards to the brake master cylinders, what you’d really want to find ( cast into the bottom of the housing ) are the numbers ( along with the Bendix logo and the specific style of piston ‘stop’ bolt ):
(1) 2227161 ( power disc brakes for 1967 - 1970 ) or
(2) 2227091 ( power disc for the Boss 429 ! ).
Have a look here:
https://www.deadnutson.com/power-brake-master-cylinder/
and here:

The 2227161 casting was used on 1967-72 Mustangs, 1967 Ford Trucks, 1967-71 Chevy and GMC Trucks, and 1967-70 Dodges and Plymouths
Also for the power or manual drum brakes look for the Bendix casting 2227061. This casting was used on 1967-73 Ford and Mercury.

Does anyone make a rebuild kit for the Bendix boosters?

Took me 10 seconds to find one: Bendix rebuild kit