Hi Corky

You're missing the arm that attaches to the motor shaft (as shown in the photo John posted). You then need a spindle that's threaded so you can clamp it to the fiberglass and attach that to the arm that you're missing - basically everything in John's photo + your motor and you're good. Two approaches you can take:

Find a threaded spindle from something else - if you look at my photos, you'll see the part I used - it came from a Ferrari mondial or 308 via ebay (and not expensive strangely enough)

Or, do what Holytree did and reuse a piece of the Alfa assembly you show in your last photo. It's a nice solution - see the thread I linked earlier - he had a threaded bolt drilled out for the spindle and used 2 nuts to mount it on the scuttle. Here's the piece you'll need from your part:

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The spindle is easily removed - there's a circlip on the top (opposite side to your photo) holding it in place