pedal box

[KevH]

when i was puting in my second hand pedal box ( for a brake servo) one of the bolts holding the clutch master cylinder sheered off, after that i notice a few of the other bolts bent and coroded.
i hav a normal pedal box here and hav noticed the only diference is the arm from the brake arm up to the servo. it seems to be riveted in in some way. im wondering, if i get this arm off can i fit it to my other pedal box. using nuts and bolts or someting similar.
can it be done and if so what should i use to fix the arm to the ordinary pedal box?

all help grateful as this is holding me up a bit!!
or do any of you hav a pedal box for servo? how much?