RS used to sell pairs of these, one red, and one black for I think $5 a pair.
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I have used this style as well in a pinch. These are a little bit bigger.
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You want Normally Open (NO Momentary). This "makes" the contact when you press the button.
When I worked at Shadow Communications from 1993-2000 in the Youngstown OH area near The Ohio Turnpike and I-80 after the I-76/I-80 split, we had at least 1 or 2 in stock, ready to go. It was an "idle time" filler, in between radio repairs.
I took 636L's and drilled out 2 holes along the top, equidistant to each other, using the tip of my soldering iron to make the starter holes, then drill out the rest of the way to fit the buttons, but out of the way of the PTT switch, wired them up so the Red button was for Up and Black for Down. The leads of the buttons had to be bent to accommodate putting the PTT switch back in.
On the RK56, the PTT was in an angle, so I had to compensate for that.
I am in Tampa, been in Florida since 2000 (Upper Pinellas County 2000-2012, moved to Tampa in 2012). I am working in the TVRO field now.