Hi there, welcome to iboats boating forums...Sorry to see you in this situation with your friend's boat. Hopefully it's not putting a wedge between the friendship as this is one of those cases where the inner feelings could make some feel a bit nauseous at times.
Maybe seeing the costs for a whole new drive sounds like it could be a better case suited for the boat insurance to help handle the situation??
Are you looking for new or used? What year is the boat?
Please know iboats forums isn't a place to ask to buy parts from others here mainly because technically speaking this is an item you could try and order new through iboats parts store.
Search terms 3868726 (1Products)
Volvo Penta Drive 3868726
$21,930.43
DriveReplaces Part NumbersVolvo Penta 872862Volvo Penta 3803408
www.iboats.com
See anything in the following that might help?,
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Do you have a photo of the overall damage maybe for other opinions? Any boat hull damage too?
What size (number) props is the boat running?