8 Speed freehub bodies... which one?

ajm

Senior Retro Guru
Rebuilding my wife's old (2001) Hahanna with / for my son and just when it was looking good and we thought we were about done we've discovered that the freehub body is bust (bent, somehow.)

As far as I can ascertain the hub (the original) is Acera-X, it's 8 speed.

Does anyone know what the difference between the RM30 and RM40 freehub bodies and whether either or both would suit as a replacement?
 
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