I just put a factory seat on and used the lowering spacers, it took a couple tries but I finally got the back "tongue" into the lower recess, and the front lock/ latch into the lower part of the latch that is on the seat base. It is tight with no movement and the gap is fairly tight.
I do have an Terry Adcox seat but I felt it was too high for me so I wanted to get it reworked but had no reference to how much to cut it down. I know now that cutting it down 1.5" or maybe even 2.0" since I can flat foot the low stock seat. This mod will allow me to customize the seat to what I want and how it looks. I am not a big fan of the light gray top cover so that will change to better match the Yamaha black paint.