Sharon Saare saddles and tree sizes

I purchased a SS last Aug. with a CC tree and supposed to be a 16" seat but was 15. So, it fit my horse great then and I spent the winter looking for the same tree but a 16. Got it and the tree, neither the 15 or 16, fit my horse any longer as he’s filled out considerably over the winter. How much difference is there between the D and E tree sizes? If I were to use the CC, I would have to use a pad the thickness of a bed sheet and it would still be a bit tight.

Could you contact the company and ask them the difference between the tree sizes?

Thanks, I’ll give that a try.