2 options Col:
Buy 2 of these:
https://www.ebay.com.au/itm/283899501449 (select ring only in the drop down, unless you want those Arca Swiss plates too). Matt and I used similar on a Tak FOA60, and they work superbly.
Or buy 80mm rings and shim them with thick felt (Bunnings, in the automotive accessory section - lots of thick black felt etc)