Need help identifying parts/prices

recently, my grandmother cleaned out her cluttered old shed, there was much more than just crafts, knick knacks and other junk. She gave me all the auto parts in there I thought I could sell. I really don't know much about these parts, where they came from, what they're for or what they'd be worth. I guess thats why im here.

Any help or clues I can get as far as pricing or what it is would be GREATLY APPRECIATED.

As far as I know, i have a complete brake hit for a 74-80 mustang, a brake booster for an old chevy, some brand new mirrors for a 54 chevy which i highly doubt are original and a cross member with spring mounts that i have no idea go to what. Ill post pics of the cross member for now as thats all i got to today. More to come, thanks!

also, ive got an entire shot of the cross member itself, its just too large to post these, i need to resize them before putting them up.

heres the pics of that crossmember resized and all.

Looks like a lowwer cross member to a bolt for a mustang 2 kit...joe

thanks a lot. any idea what it could be worth?

My guess is that it isn't worth very much, unless you have the rest of it; the missing part is the upper control arm and coil spring support. RB's used to sell a bolt in Mustang II crossmember, this might be what you have.

if theres an A arm that goes with it, I dont have that. But I do have the coil mount. Any idea what the 3 pieces together are?

Heres a shot of the brake booster that supposidly will fit any 49-54 chev.
And this brake kit, this is what I have the most questions about. It Came with a booklet from "SSBC" or stainless steel brake corp. the curious thing about this is that the parts list seemed to have a lot more than what I think I have. and the order number was said to be in the 800$ range. So im curious as to what i have in my possession is worth.

And as always, any input whatsoever is greatly appreciated.