blown sr tranny

I am looking for a blown tranny. Basically I need the front cover that is inside the bellhousing that the clutch pivot ball mounts to and that the throwout bearing slides on. The peice on mine that the throwout bearing slides on has broken off. I am unsure whether or not the cover from a ka tranny will work but they do look very similar. If anyone knows if you can swap them back and forth please let me know.

Thanks in advance,
Corey