I didn't keep the part numbers for all the MK bits I used but I remember the fixed landing gear was "mighty gear LL". The tank I used is MK 450cc square. the kit is meant for 400cc and 450cc square tanks from MK but any other square tank will do. Do not order MK360cc tank as it is oval and difficult to fit.
Elevator and aileron: MK0804 Aluminum horn medium. You need 4 pcs.
Rudder horns are MK0815 medium special horn. It was only just big enough for the very wide hingeline so consider using 0816 big special horn instead. 2 pcs. required.
Wheels are MK 55 mm MK0505
Tail gear set MK0581, 1 pcs required

You do not need the MK parts, but they are nice and fit well. If I could only have one original MK part for the SkyStar it would be the Tail gear set: It's perfect for the kit and fits like a glove with no adjustment.