^ I believe that Penthouse photo is from 1992 if my memory is right. in this photo, Tracy is with Danni Asche. Danni, unlike Tracy, was all natural and a small woman at 5' 1" tall but Danni was an entrepreneur who realized how important was the internet and moved quickly to establish a site which she later sold to Penthouse I believe for several million Dollars. 
This is the first time I’ve seen this photo, and it gives me a terrific comparison, for all sorts of reasons.
So, first up, if Danni is about 5’1”, then this photo puts her about 4/5” shorter than Traci (Traci is also wearing taller heels), which would put Traci at about 5’5” or 5’4”.
Based on Danni’s height and her really slim frame, I’d put her at a 32G, or possibly even a pretty-much perfect 32GG - she might even be a 30H or 30J, depending on the bra manufacturer. (If i was a tiny bit slimmer in the frame, her boobs would be almost exactly like my own - same shape and curve). I’d like to see more photos of her wearing a bra to get a closer inspection of her fit.
With all this on mind, and looking at Traci’s frame, I had previously thought Traci would be in the 32K category, and I think that’s a pretty decent assessment - but looking at her in this photo, she might need a slightly wider band, but I think 32K is pretty close to what would have worked for her. Of course, we’ll never know now, as she’s long-retired and had her implants removed, from what I can tell.
Both are really beautiful women. The interesting thing for me now, is 32K isn’t altogether uncommon a size - usually on a slightly more rounded body though - but I’m sure it was a revelation to see a model this size in the 90s, especially one so slim. (Isn’t it funny how the photographers can make Traci look so tall with a pair of 5” heels and a low bed?)