Incidentally,
.....a friend is swapping out his 4 cyl subie for a new Lycoming and had to buy a new motor mount AND gear legs since they're drilled as a unit for his -7. If you want to use the old legs, I found out, you can send them back to Van's to match drill the holes in the new mount. It also depends on the year of gear leg manufacture, whether they have numbers or letters stamped on top.
Regards,