I wasn't aware that DANGER DIABOLIK had an official soundtrack release....
It is a nice sounding re-recording by the Solisti e Orchestre del Cinema Italiano. According to the booklet, it is the complete re-recorded soundtrack to both DANGER DIABOLIK and FOR A FEW DOLLARS MORE. It comes in a clamshell double CD case inside a cardboard slipcover. It has a good-sized booklet written in English.