For use when replacing a Volvo or BMW sterndrive with a standard MerCrusier Alpha or Bravo sterndrive assembly. This kit provides a rugged mounting support that seals the competitors' larger transom cutouts and eliminates costly rework to fiberglass, aluminum, or steel transoms.. Fits:. 1970-1987 BMW Z-drives Mark 1 & Mark 2. 1969-1977 Volvo AQ250, 270, 275, 280, 258, 290 & 290DP. 1997 & older Volvo DP sterndrivedrives