Did you buy the battery from HD, or from a parts house?
With an HD battery, there should be any need for spacers.
With an aftermarket battery, their "Universal" fit, isn't always universal.
Screws should be metric thread. Using small spacers and longr screws, you should be able to mount the cable with little to no effort.
“Peter, arson is a serious crime. It's not like smuggling Oriental hookers into the country, in steel drums........” ~ Glenn Quagmire~