There are no 70-75 carbs. There are 70-71, 72-73 and 74-75 carbs, they changed every two years. They changed the jetting mostly but in 72 they went from a raised floor carb to a flat floor carb. As well as how the enricheners worked.
Don't buy a kit. Most of the parts in kits won't work. About the only part that will is the float bowl gasket.
This will help ID your carbs www.xs650.fi/pohja_files/fi/XS650carbs.htm
this will help with the tear down, cleaning, inspection, reassembly and adjustments, www.amckayltd.com/carbguide.pdf
Once you tear down, inspect then you will know just what you need to replace.
Leo
Don't buy a kit. Most of the parts in kits won't work. About the only part that will is the float bowl gasket.
This will help ID your carbs www.xs650.fi/pohja_files/fi/XS650carbs.htm
this will help with the tear down, cleaning, inspection, reassembly and adjustments, www.amckayltd.com/carbguide.pdf
Once you tear down, inspect then you will know just what you need to replace.
Leo