1996 polaris sportsman 400 counter balance dipstick broken, need info

Hi guys, I recently bought a 1990’s polaris sportsman and the previous owner broke the counter balance dipstick off inside the engine which I was able to remove the metal stick and most of the broken plastic! Does anyone know what thread that is inside where the dipstick threads in at as I would like to insert a bolt for now, also does anyone know the part number for the dipstick that is supposed to go in there I cannot find this info anywhere and have not seen a stick like this one on ebay! It is the one with the screwdriver slot in it, thanks