Joe, the MKIIa spits had fixed tail wheels, atleast from what my sources tell me and they would have had either the a or b wing depending on when they were built. The first 750 Mks had the 'a' wing and the other 170 had the 'b' wing. The nose of your plane will have to be shortened to reflect the smaller engine and of course, the exhausts redesigned as well. Also the MKII's only have one radiator under the right wing the other side has a small round intake. The fin and rudder of the MKII is also different than the Mk IX.. if you have a later MKIX.. and the engine air intake in the bottom of the fuse for the MKII's are smaller ... Hope this helps. BobH.