This is a replacement servo case set for the Futaba S3101 servo. It includes / the top, middle, and bottom case pieces. The case set does not include screws, / grommets, etc. Although the S3101 is similar to the older S133s, the case / is not the same. / / REQUIRES; (4) Case assembly screws - part #8M00A02301 / / 2/17/97 gmo