This style of homologation plate appeared on all bevel twins prior to the release of the MHR in 1979.
Of this style there are 3 types as follows;
** Type 1 > DUCATI DM 750 S - all 750GT and 750 Sport.
** Type 2 > DUCATI DM 750 SS - all squarecase 750 SS.
** Type 3 > DUCATI DM 860 S - all squarecase 900SS(not '75), all 860GT/900GTS and Darmah.
Please re-read the above, then carefully chose which 'TYPE' of tag you need for your particular bike.
Each aluminum plate tag comes complete with 2 proper installation rivits. I suggest you use a nail set to drive it in - don't try to drive it in using only a hammer.