They are WD Enterprise 4360 drives, but the model number on them doesn't match what's shown on the WD website. Since I know for a fact that they are 80-pin drives, the only 80 pin model they list is the WDE4360-0008, which is a 7200rpm drive. Two of the drives bear Compaq stickers, so the 6008 model probably denotes drives that were originally used in Compaqs.

Right now I'm leaning towards buying a combo 80 to 68&50pin adapter, since it keeps my options open in case the drives don't quite fit into my target Macs.

Also, I remember reading somewhere that high-byte termination was only needed if the drive was larger than 4.5gb. Since my drives are smaller than that (at 4.3gb), do I still need to have high-byte termination?