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Re throttle bodies, there is a domed 10mm hex head flanged bolt (M6) which bolts down the throttle bodies at each end. Once these are in place, the throttle bodies should be into the rubber adapter boots far enough.
The yellow arrows point to the rear-most bolt and the blue points to the front one (in behind the throttle cable cam).
The rubber boots come up to the top of the band, where the red line is.
When you're putting the throttles into the boots, you press down one end first then the other, almost waggling the throttles into them and should feel a satisfying pop almost, as they seat home.