We used the old style M998 external mirrors. For the interior we used a M151A1 & M151A2 mirror bracket with the offset mirror. When all possible we use military vehicle related items. If these was still in service a MWO could have been issued to upgrade. Not to take away from the originalty but for safty reasons to operate on public roads. This maybe an alternative for you if planing on driving your M37 as daily or a simi-daily driver and also your state may require as such mirror system.