Here's the full windows drivers that I retrieved from two floppy disks from Pacific Data Products. One is from a 25 In One floppy (HP II only), the other from a 25 In One III floppy (HP II/III). They are all zipped into one file. Make sure you select recurse folders so that the folders unzip properly.
I had some difficulty retrieving files from the 25in1 III disk, but I think all files copied ok. Also, I haven't installed these yet, but as some users here have said, the drivers work in Windows 98... Good luck.