Imagine you are shopping for the PERFECT pair of jeans. You know the kind: perfectly fitting, not too loose, not too tight and comfortable for prolonged periods of time. Not prone to pinching or rubbing you the wrong way, if you get my drift. (As in owwww, not ohhhh). Now, expect those jeans to fit two different species equally well.
Welcome to the rider's dilemma.
I mean it's tough enough for the stereotypically slender rider with a small tail. When you're a T-Rex? On a budget? Sweet Jurassic.
Years ago I was lucky enough to find a dressage saddle that fit horses like a dream and accommodated my tail beautifully. And 2nd hand to boot. And it was adjustable. God, I loved that saddle. I was keeping that saddle until I fossilized. Seriously, trying to suggest a different saddle would get your head bitten off.
And then it got stolen out of my car, which meant saddle hunt (Yes, I drive. Even a T-Rex has to get around).
So, several saddle trials later I finally found a reasonably priced replacement of ... the same brand and model I had before.
Evidently, saddles have evolved on a different path. Take up archeology. Way easier, possibly cheaper.