On raft/pontoon you roughly want 1/3 of the oar inside the boat. So assuming you have a 1448 (ie 48" floor) with 70" beam, your looking at 9 ft oars. On drift boats you usually have less oar inside the boat, but drift boat rowers usually add lots of weight to counter-balance their oars.
Height of oarlocks will also change things.
If it were me I would look at Carlise. Fairly tough and affordable. You can also get a 1 ft extension, nice for trying out a longer oar.
Composite too expensive (nice but expensive), although the Sawyer Polecats are just above the Carlise prices
Wood, expensive and take regular maintenance.
All are very expensive to ship. Sometimes it is cheaper to buy the more expensive 2 piece and save money on shipping.
NRS, clavey, inflatableboatpeople, river connection, cascade, etc are online places to look for oars.