We have the HD-99 not the HD-99H and when we order the bits from Ground Hog they send us a bit that is too shallow and will not fit. The current bit is a SB-25 with the number 1986 stamped above. The Drill itself has 12-C5 stamped on the bottom of the drill. There is a decal that has DC-DARA on the shaft of the drill. Can anyone help me with getting this bit as we have none of the bits working that came with the unit. Thank you