Harley Jane and Heidi Kozak are not related. Harley Jane was born in Pennsylvania, and Heidi is Danish. They are contemporaries, and neither one offered much nudity.
Heidi Kozak
… at least gave us a good rear view in Friday the 13th, Part VII (1988)
Harley Jane Kozak
… was topless on her back for a few moments in Side Out (1990),
… and offered a bit of side-boob in an episode of Dream On (s5e7, 1994)
These nudographies are not likely to expand.
Heidi is 69, and is retired now, although IMDb indicates that she emerged from retirement after nine years to appear in a 2023 movie called The Mux. (I’ve never heard of it, and it has only nine votes at IMDb.)
Harley Jane is still acting, but is 68 and her last nudity was 30 years ago.

Harley Jane Kozak, Marcia Strassman, and Jan Smithers have always been conflated in my head. I am constantly getting confused on who was in what movie or TV show.
They represent a certain girl next door look from the late 70s and 80s that doesn’t really seem to be around anymore in Hollywood.
I had to check IMDB to be sure Harley Jane wasn’t Julie Kotter. I never mixed Jan Smithers with Marcia Strassman, though. Speaking of Welcome Back Kotter, I recently watched a 10-year-old YouTube video of Gabe Kaplan doing standup. He talked about how he saw a Vegas comedian doing a Gabe Kaplan impression. He said he went to see if he could get that gig, but was told his “Gabe Kaplan” wasn’t good enough.
You forgot Theo, but I’m guessing that one never offered much nudity either
Who loves you baby!
(Yes, we know it’s actually Kojack.)
“Dream On” was a heck of a good tv program.
A fun show with quite a bit of nudity.