Well, going off my picture, it likely wouldn't be too bad to install a set. As I mentioned, I unbolted the clamps to use the hole to thread a cord through.
They actually had these bushings/inserts:
https://www.amazon.com/SeaSense-Oar-Lock-Socket-Insert/dp/B004RDSOFY/ref=pd_bxgy_img_2/132-2147541-4712850?_encoding=UTF8&pd_rd_i=B004RDSOFY&pd_rd_r=8fa80f36-fb02-47b8-acb7-cd418cf04700&pd_rd_w=GbaBQ&pd_rd_wg=E5CJS&pf_rd_p=ce6c479b-ef53-49a6-845b-bbbf35c28dd3&pf_rd_r=2YCFPARHRHSGM76JZ5PE&psc=1&refRID=2YCFPARHRHSGM76JZ5PE
I'm fairly certain with a little work, you might be able to get your hands up into the decoy rails that run the length to the dodger and through-bolt these:
https://www.amazon.com/SeaSense-Lock-Sockets-2-Inch-Locks/dp/B004RDMNI8/ref=pd_sim_nf_200_6/132-2147541-4712850?_encoding=UTF8&pd_rd_i=B004RDMNI8&pd_rd_r=10340a79-d75b-4b31-9080-7f27198433b0&pd_rd_w=F7l8G&pd_rd_wg=ot7tT&pf_rd_p=ec5f570b-7db1-4816-9bbe-a67d0b1d643f&pf_rd_r=5Q02AWJGV49PCD8VK7KG&psc=1&refRID=5Q02AWJGV49PCD8VK7KG
These are actually what was on the boat when I bought it:
https://www.amazon.com/SeaSense-91135-Clmp-Hvy-Locks/dp/B000QU5SVK
I definitely misspoke. The older generations didn't have oarlocks. If you don't have enough room to get your hand inside the decoy rails from the inside, you could through-bolt through the decoy rails with some SS hardware painted to match the boat.
Those boats move perfect with a 9.9. A 15 is plenty fast. They are super light boats. Just be very cautious crossing open water with them. I buried the bow on mine the end of last season and it got harrowing really quick.