You're needing the TP60 headshell for the TD 165....they're often available on eBay.uk where there are a lot more Thorens decks around. Make sure they come with the right metric screws/bolts to mount carts, and the adjusters/spacers that go between the top of the cart and the inside bottom of the heashell. Those spacers can Help with getting VTA right, as the TP11 arm seems to be a little high on the bearing end without using spacers. A Stanton 681eee really works well with this arm/headshell combo, and an 881s or Pickering XSV 3000 are even sweeter.
You can get sorbothane damping strips to apply to surfaces to reduce vibration, and I've used triangles of cork underneath the inner platter as well. There's also a special kit available on eBay.uk and in the us, that offers a plastic disc and special lubricating oil to improve bearing performance, and to raise the platter by a mm or so, which helps with VTA.(Check for the name Joel on the Thorens performance improvement kits, he seems to know his craft). This table made it easy for me to decide to put my auto-stop JVC QL-A7 aside, and previous to hearing the difference I'd thought I had a very solid deck in my system.
Great turntable,and worth upgrading.