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I figured out what I wanna do, what size bubble helmets helmet do I need to turn my SoBs into savage retro space Barbies?

There's the bubble helmets by Bombshell in different sizes and with collar as well as without (just the dome):

https://bombshellminis.com/36021-helmet-set-r10/ (example, look through the shop to find more.)

Not sure which fit, though.

The Old Glory merc also can be ordered with Bubble Helmets. Quite costly though if you only want the helmets.

https://www.oldglory25s.com/index.php?cat_id=819&catname=%27Aliens%20And%20Spacemen%27

'Savage retro space barbies' has a nice ring to itby the way.

Yeah bombshell make good clear helmets. They're on the large side though.