What is the dead battery's voltage when running TEST 9 (or if you have a multimeter)?
My suggestion for replacement battery is either a 49/H8 or 95R/H9 battery class size. You can find lots of different battery brands...many made by the same manufacutrer...but what fits and usually has specs great enough to handle your vehicle is a battery in either of the 2 battery class size aforementioned.
Also...don't forget to vent the battery...or if having someone else install the battery...let them know there's a vent tube that must be connected to the battery when they install it.
The chart below gives yiu an idea of what specs to look for when searching for a replacement battery. You can go lead acid or AGM etc...but you can see what the average specs for the 49/H8 & 95R/H9 batterires shouldbe close to: