Porsche Bolt Pattern in Stock Drums

[yellow73]

I finally found the wheels that I am looking for and they have a 5x130 bolt pattern. Can stock rear drums be drilled for this pattern and be safe? I will eventually go to rear discs but this would allow me to get the wheels on the car a lot sooner. I have not had the drums off in a while and can't remember if there is enough material to drill into other than for the stock pattern.