I have not found any official websites however would help to make one if I can. J & C is a good source for parts and are reasonably priced compared to Cessna etc. I replaced many control cables last year with old stock NEW parts for a total of $120.00. I have not had any corrosion issues yet. My A/C has spent most of it's life in Northern British Columbia and Northwest Territories in this cold and dry climate.
I have done a little research on Lark history and came up with a few stats.
From what I can tell, there were 213 total built from 1968 to 1971. About 140 still reside in the US while 13 are registered in Canada. Serial numbers start at 5001 and go to the 5213. They all were built with hard seats.
My biggest wish would be an STC to add a constant speed prop (they were designed for it) and a type of STOL kit. If anyone knows a way to go about this please let me know.