A backup saveset containing the object files for Moeller's PK2K SCSI driver can be found here. I've given the file a ".gif" extension so this webserver will know to send it to you in binary. When you get the file over to your VAX, you'll have to arrange for it to become a fixed-length 32256-byte record file so BACKUP can unpack it. This should be done fairly easily using $ SET FILE/ATTR.
In addition to the object files, there is a DOIT.COM command file which links the driver. Execute this to create the executable on your machine. I assembled the driver on a machine running VMS G7.1; you'll want to link against whatever version you're running.