chridabs OP
Bottom plates/configurations (of the arms), VTA adjustable bases vary, (depends what TT it came off of). Mounting parts vary, not all accessory parts are still included. Pay attention, look at many listings until you know what is being sold. Look at what separate parts are listed for sale on hifishark, to learn.
New install in a plinth, you drill a 28mm hole for the arm post. If possible get a/the thick heavy 'stabilizer' bottom nut. If not, you can stack a few nuts to have more weight below. Not needed, but why not. The Acos Lustre GST-801 has a very thick heavy bottom stabilizer nut also.
This listing shows the dark colored OEM stabilizer.
The lever that tightens to lock the VTA arm height can break, I got a big allen head metric screw for my friend's arm, textured rim, still able to tighten by hand.
Also, for my friend, I needed to get a large washer from a hardware store to provide a transition diameter from the arm post (+/- 26mm?) to the hole in the TT's plate we received.
The sliding/locking arm plates are two layers, the bottom layer is always the same, a big oval cutout, it is the part that locks in the tracks, The top layer varies, small star shape, medium, large hole, it simply screws onto the bottom layer. So, IF needed, a small hole in a top plate could be made bigger if perhaps you receive a plate with too small diameter hole.
However, think long, you might want a different arm in the future. Of course with the 441, you only need 1 lower layer and simply change the top layer as needed, now or the future.