Hello,, are you talking about the ¼ scale HITECH -HS-805BB- which are the big ones for his biceps/shoulders and stomach,,etc.,,, or the medium size for his Forearms..?—or both,,, there’s a million and one servos and sizes out there on the market-,,, I will do I couple of pictures with measurements of the Inmoov servo housing this week so people can check if a certain size will fit- this seems to be a pretty common question and a picture normally speaks a thousand words-,,, if possible try to use the- hitech HS-805BB recommended by Mr Gael- he has done the expensive work of buying and frying Servos so we don’t have too,,,, (unless you got lots of money for R&D to try new stuff out)– hope you enjoy the build—

the million and one unfortunately is the truth – make sure you get the right dimensions to make them fit onto the printed parts or be prepared that you need to modify the parts before printing to match your servo’s dimensions.
you can also find some alternate parts in gaels alternate section or on thingiverse that will fit other servo dimensions. It is worth to spend time on modifying parts as trying to fit different servos into the holders is very hard and in addition you might not be very happy with the result. at least that is true for me.