We recommend this stainless steel mounting bracket to mount the Schmitt tank STT43021 - suitable for Simson Sperber - together with the bearing rubber / Schmitt rubber adapter STT44578 on the S50 or S51 upper belt or frame. The bracket spans the offset rear mounting position of the Sperber petrol tank on the Simson S50 or S51 upper belt. With the enclosed small parts, a rubber-mounted, stable connection is quickly possible. No unnecessary tinkering!