Guidance on creating servo housings

I'm currently trying to build a hexapod robot, and I'm struggling with figuring out how to create housings for my servos. I've made the unfortunate mistake of purchasing off of Amazon, leaving me no reliable datasheet with which to work with; I don't even know the dimensions of the splines!

So far I've CAD-ed this servo holder:

And I'm pretty sure I know how to continue, but not until I can figure out the dimensions for the splines, as well as the splines' position relative to the servo body. How could I go about figuring this out?

Servo link: here

Count and divide 360 by count.

Or, use the internet.

Googling DS3235SG quickly produced measurements which included the position of the spline.

Whether they are reliable or not you won't know until you have the actual servos in hand and measure the dimensions with a vernier caliper.

Hello theaxatium

Use this 3D model to do the design work for the housings for the servos.