Yes, the mount is compatible with standard rimfire and air rifle dovetail rails.
Length is 120mm. Full specifications can be found on our product page, here: https://us.hawkeoptics.com/match-mount-1-1-piece-9-11mm-medium.html
The mount should be compatible with standard rimfire dovetail rails.
This mount is designed for 9-11mm and 3/8" dovetails which are most common on rimfire and air rifles. Centerfire rifles will typically utilize a weaver or picatinny style base, or less commonly, a wider dovetail. If the rifle's base is compatible with 9-11mm or 3/8" this mount should be capable of handling centerfire recoil.
Yes, this mount is a great match for a Marlin Model 60 and will accommodate that scope.
You will definitely need a separate set of rings because a one piece is not going to work on your receiver. I would recommend MPN: 22102 instead because of the heavy barrel and the adjustable objective. Please email us at techsales@opticsplanet.com and we can provide more appropriate options.
It will fit fine on the 802 and should fit the 702 as well, if anything there might be a very small amount of overhang.
This will mount on the dovetail, however it might be a little long, it could overhang the back and interfere with hammer manipulation.