I found a small container (Looks like a toothpaste tube) of Bendic Vacuum Power Cylinder (VPC) lubricant, Part #377299 on the internet. It is in the original tube and box, unopened and I plan to keep it that way if possible. When I had my hydrovac rebuilt for my 49, 6400 series, an brake repair shop had a can of the lubricant and let me have a couple of ounces. I chased this stuff down and ended up with a Texaco number for the lube, but have since lost the number.