Just measured my Arrow, and the mains gear height, and from wing bottom to axle center is 4 7/8". Not sure on the nose retract because its all in the box with the YS 61 long stroke, pipe etc.
Took my Caylpso out to knock the dust off today, preparing for a BPA contest this weekend in Ft Walton Beach Fl. It was clocked at 104mph on the flat last summer, and it hasn't lost a thing .
I'm running Nova Rossi ABC's, with very few moving parts and runs like a clock. 14,700 14,900, static 11x7 APC. Its not a YS, but it hauls the mail .