Build Your Own Clone Message Board

I'm hoping I could perhaps get some verification on these parts before I head to soldering. I'm a but uncertain on my interpretation. Here is what I'm struggling with.

• The kit should have 4 trim pots, 1 1M and 3 100k.
• The labeling here is confusing me. The printing looks like there are two "15..4?" one "15... V?" and one "16... V?" I also see markings A8, A4, Maybe 43 and Q3 or C3? Anyhow, I expected to easily pick the 100k ones thinking there would be three identical pots here, but it just doesn't seem like it.
• The Dual element Opot Couplers are supposed to have a gray dot on the side that should be facing up. Mine do not have any such markings.
• I'm guessing that the proper rotation would be so that the slightly longer lead would feed into the square hole in the PCB. Would this be correct?

Any help or feedback here would be appreciated, as always. Thanks everyone!

Trimpots: Try looking on the underneath side for the resistance labeling (in small lettering). The 1M should say 105 (i.e. 10 + 5 more zeroes) and the 100Ks, 104. And you can always measure the resistance across the two silver pads at the bottom of each trimpot in your photo, to be sure.

Optocouplers: Yes, your orientation assumption is correct.

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