I'm trying to find the Torrey Pines course that was released for Links LS (97/98).
Yes, he "Torrey Pines" course is part of the "Links 5-Course Library Volume 4" expansion disc (1997-1999), which includes not only
* Torrey Pines (La Jolla, California)
* Oakland Hills Country Club (Bloomfield Hills, Michigan)
* Hyatt Dorado Beach (Puerto Rico)
* Castle Pines Golf Club (Castle Rock, Colorado)
* Pelican Hill Golf Club (Newport Coast, California)
If these extra courses are packaged like the ones from the first three "Links 5-Course Library Volume"-expansions, then you just need to copy the corresponding ".CRX" (course) and ".ENV" (custom sounds) files into your "Links LS98" game main directory.
But I can not test it, because I am still waiting for the delivery of the volume 3 and volume 4 discs/package that I have bought from second hand...
Sorry, I could only confirm the existence of the (native) LS version of the "Torrey Pines" course.