Need help installing assets into avatar!

[Suevo]

Is there any way to use these two assets together for the same avatar?
Butt PB
Tummy Bulge
I tried everything I could think of; however, I'm still new to vrchat cc, so id love any help

[Suevo]

Here is where I found DL links to each asset:
Butt PB Location
Tummy Bulge Location
I used the Chocolat model for this

[Suevo]

The issue is that Butt PB overwrites the main body, and the tummy bulge creates a new body. I can only use one of them at a time, and Butt PB takes priority. I'm hoping there's a way to merge both bodies into one.