The center console cup holder in 2nd gen tacomas is barely useful due to its small size. I specifically have a late model tacoma ('12-'15) but I feel confident in saying this adapter will work for the rest of the 2nd gen years ('05-'11).

This adapter was specifically made for the 32oz wide mouth nalgene. The diameter of the adapter is 3.75 inches. It's hard getting exact measurements so the adapter is ever so slightly smaller than the cup holder. I folded up a paper towel and shoved it in with the adapter and now it's fairly snug.

If I were to print this again, I would test out increasing the base diameter from 2.5" to 2.6".