Hey Dan are you thinking of the Wintec Australian stock saddle? They are very good saddles, quite a few of my friends ride in them and have nothing but good things to say about them. I seriously looked at getting a Wintec stock even though I have been riding in a western for the last 16 years. I thought that the interchangeable gullet system may have been the answer to the width of my mares back. On closer inspection the extra wide gullet still was not wide enough - Phoenix is ridiculously wide across the shoulders and wither - and at this stage is only four. So still has some filling out to do
I knew nothing about Abetta saddles I was just trying to find something wide enough to fit Phoenny when I stumbled on the brand. I was really surprised to find that Wintec saddles are so cheap in the states! In the States my Abetta was a little more expensive than the Wintec but in comparison to what I would be paying for a saddle here in NZ the extra dollars were relative. It ended up costing me $1780 NZ dollars for my Abetta, this included postage and duty fees etc. The irony is it would be cheaper for me to buy a Wintec through the States - under $1700. To buy a new Wintec saddle here in New Zealand it costs about $3500. Way to costly for me!
Sorry went off on a bit of a tangent there. The point I am trying to get to is that you may have to buy for fit rather than brand. Measure the width of your horses back so you have a starting point. You can find websites that show you how to do this. Once you have that measurement then start your shopping. I don't know what sort of size a Belgian will get to, you may be fortunate and be able to get a Wintec with the interchangeble gullet system - good luck.