Need (3) Trackpad _PARTs_ (and guide would be nice too).

We have three Mac laptops that need work. Once certainly, and the other two probably need (at a minimum) their track pads replaced. I can’t find a repair “guide” for the how-to portion of the project(s), but more to the point, I can’t find the _PARTs_ on websites that I trust (like this one). [eBay? Yea, probably I could find it there.]

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The three machines are:

MacBook Pro 6,2 (15-inch, Mid 2010), cracked trackpad, virtual buttons do not work, so a mouse is required.

MacBook Pro 7,1 (13-inch, Mid 2010), virtual “mouse” buttons typically do not work on track pad, so again a mouse is generally needed.

MacBook 6,1 [i.e.: NOT a ‘Pro’!]

Trackpad situation uncertain, keyboard is missing three keys:

“F3”, “, <“ and. “/ ?”

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Can anyone refer me to a reputable site to purchase the part(s)

and/or

a useful website, YouTube video, etc. for the “How-to” portion?

.