Theres a Little Play in them.....But if it Seems like alot.....I'd just Put New Savers on...or you could try adding a shim
(There Cheap and as with most plastic Parts.......Should be replaced as they wear out)
and Yes you Can use the Savers from the MGT.......(And use Have to use them for Hitec or other Servos with a different Spline count
.....with the Tops off the Stockers) But the Stockers with a Extra spring or 2 are just as Good if not Stronger.......