So, as it turns out, I am basically a walking crash course on what not to do when buying a saddle sight unseen.
I dredged up the old ad to find the exact wording and had my memory jogged that the tree had been replaced in this saddle. I did not immediately recall this because I had been looking at two nearly-identical saddles and one sold out from under me so I panicked and “Buy It Now”-ed the latter. My bad times a million for not getting exact measurements. Now everyone can chastise me more! It did definitely specify medium tree, but thanks to this thread I’ve been disabused of the notion that that has any real meaning!
That said, I’ve gotten some great solutions on this thread and if all else fails I am more confident about my resale prospects. It is a really nice saddle and honestly if I sell it I will go right back out and buy another one in the correct tree size and a forward flap.
And next time I will very likely suck it up and do the trial, the fitter, etc. etc. etc. Silly me for thinking I could snatch up a bargain online. I am definitely still in the realm of needing professional guidance.