I want 3.1 ROMS on my A4000 to run WK 3.1.....but there is only A4000T 3.1 ROM's which won't do without the Tower Workbench.......I feel victimised! 
They should work fine in an A4000D, the only difference is that workbench.library is removed to make way for the A4091 SCSI device. Any Workbench 3.1 disk set will have workbench.library on the disks anyway, there are no specific A4000T versions of Workbench 3.1 disks. :-)