I can't think of any K5 top that has drip rails. On my '72 the only drip rail is on the windshield frame itself nothing on the fiberglass topper.
Edit: Well, Damn. I just checked the topper in the attic of my garage and it does have driprails arount each door opening. The top has been off for 4 years so I didn't recall. But I would know how to answer your question.