Well, they don't actually represent anything anymore. In the old codex they identified all the existing support system bits at the time, but in the new kits they've come up with all these different ones and deliberately avoided labeling them. The idea is you can basically use anything you want to represent whatever support system you want, though it's probably a good idea to use the same bit to represent that system throughout the army.
Bit 74 looks like a multitracker, though, or at least the bit that GW called a multitracker from the crisis suit kit.
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