I thought you young guys can google anything, bloody slacker
Okay mate, if you need to replace your chain and sprocket's, it will always be a bit dear on the 750 if you stick with the OEM gear.
Not too many guys on here will still own both, have pictures of both, never mind side by side, or working on them....
There is 3 options. (This is a quick breakdown only)
1. Buy OEM and pay heavily, and keep in mind that you are getting a ally rear sprocket at a premium HIGH price.
2. Get a 1000F4 or 910s Brutale and later model carrier etc, pay a bit more now, or less if you can get it secondhand, but you have the option of long time steel sprockets ($) or fairly okay ally sprockets (cheap).
3. You can get a STM or Tallon Carrier, looks cool, but like Noel said, you HAVE to use their rear sprockets, good thing is, they look cool, and the sprockets are cheap. But the over-all conversion is costly.
I recommend option 2 every time, with option 3 next.
If Noel or CAG can't help you out of the US , there is Al at Design Corse and Mark at Timemachinebikes in the UK as another option.
You have had a look at the forum sponsors, I hope -http://www.mvagusta.net/forum/forumdisplay.php?f=35
Here's a few pics. Ask away young man