Matt,
I think most are rigged with 1 1/2 inch drains. TH Marine makes the plugs that fit well. I can order a couple for you to see if they work. I can mail them to you or send the with one of the Tampa Bay guys heading your way in 2 weekends.
Sorry, reread your post and saw that 1 1/2 plugs won't work. I can try sending 1 1/8 plugs instead. I have never seen the 1 1/4. This is the one with the standpipe?