Anyone know where to find a BB A body transmission filler tube???

Not a flexible, not some one size fits all, an actual BB A body filler tube???

Were on number three: two mancini's, one flexible, and none work quite how they should...

I know some on here say they don't have an issue, some say flexible worked for them, I say the flexible won't make the turn and the other won't fit at all...

Please help...