What year is your boat? That can help determine Gen 1 or 2 as well as the serial number will be able to tell you.
You can always purchase a bolt on skeg guard to replace the missing lower portion, as long as there is no damage to the gear housing (I would pressure test), lower units are quite expensive to replace and I wouldnít just toss it until confirming it is unsalvageable
Stainless props are very expensive and there are many opinions on them, IMO I would rather have an aluminum prop that will bend and break as opposed to transferring possible damage into the gear housing if an impact occurs.
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2000, 2100SR 5.7 Alpha 1 Gen 2