Servos are servos. No need to stick with any particular brand. They are somewhat standardized in size like standard (1/10 surface RC uses these almost exclusively except crawlers), mini servos, and micro sizes, but you really gotta look at the dimensions to ensure they fit. Savox is good about showing drawings for all their servos with dimensions on their website for example.
So there is also
www.servodatabase.com. Here is a link to your servo specs there...
https://servodatabase.com/servo/align/ds510
What you have there is a mini servo. Reefs makes some of the best minis. But Savox, Hitec, and many other manufacturers out there have good servos. Shop around, look at torque (higher the better) and speed/60° (lower is better), and dimensions and see what you can find. I shop on Amain for my servos, but there are lots of hobby shops out there that sell servos.
If you need expert help, contact the guys over at
www.helidirect.com. They will get you squared away.