As Burro 2 has a set of gate hinges I just ordered a new set today $44 dollars from the original manufacturer Polar Hardware, I will put these on the "red ass" and the old ones which were ok but looked a little old on the new paint
, will go to Burro2, probably.
The originals are Polar 401's they have been replaced by Polar 411's which are 304 stainless steel, I prefer 316 ss but 304 should be fine in this application. Make sure you specify that you want a 0 degree offset.
Anyway here is the website: Polished Stainless Steel Hinges on Polar Hardware Mfg., Co.
Hope this helps!