Assume that the SqD busbars that you might be wanting to use are either the long Neutral or Ground busbars.
Many folks use either the MidNite or Outback insulated busbars:https://www.solar-electric.com/catalogsearch/result/?q=midnite+insulated+bus+bar
You could even use the insulating ends from some of the above on a longer SqD bar.
Just one approach. FWIW, Vic