The "Lark" is available through AMA's plan site. The cross ref. is Pond plan service No. 44A1. There aer three "Skylarks listed, Dare 31" span, 33G8, (I know, you don't want that one), Pallet 53" span 45B7and a Dixon plan with a 54" span, 44A5.
Good luck, Jerry
PS: One of the Mackey Larks has an elliptical wing.