I will try to add pics, if I can't get it done you should be able to see my installed horns in my gallery. You may want to take a look there anyway.
AFI (Marinco) electric compact twin horns. A marine product, very resistant to adverse weather conditions. Maybe not quite as loud (109 dbA) as Stebel air, but IMO more reliable and from where I mounted 'em they are very effective in projecting the sound forward.
I used 20 amp in-line fuse and 30 amp relay. I disconnected the factory horn hidden in the left lower cowling (it was barely audible from there anyway), and kept the stock factory horn on the right side near the exhaust. Results in three horns, two right out front, and MUCH better than stock.
They are available from many vendors, here is one of the better ones.
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Well, I gotta work on learnin' how to upload pics from my files to here. Sorry. I'll try to post 'em later if I get smart enuff.