Can I replace one of the plastic clips on the CPI?
And how do I know what trans I got?

 

The individual lines from the central injector are replaceable, at least according to what I've seen available for sale at RockAuto.

There is only the manual or automatic transmission. Is that your question? However, I thought I had my original transmission when I had mine rebuilt but it turned out the label sticker said it was not the original.