my friend has a unit in a plinth with a dust-cover. it looks like OEM Technics to me, I could check. Grace arm is in a circular removable board, also looks OEM, with a long oval cutout for various lengths.
removable arm board looks like this
(seller says fits 9 or 12 sme arms
the platter has a wide rim, so I am not sure how short an arm will fit. chakster said 10.5" or 12".
so it’s not too short or not too long and the fastening from below has to work with the structure of the plinth.
I therefore don’t know if the 7045 is too short, and I was hoping someone knew, if the 7082’s 282mm (11-1/8") spindle to pivot, and the diameter of the arms base plate are long enough/small enough to not hit the rectangular platter housing.
next to last lousy photo here shows the underside, we would need to verify what my friend has