Keith welcome.
The servo arms are made by a company in Germany called Gabriel Stahlformenbau, I buy mine from
http://www.der-schweighofer.at/en/pr...m3_kugelgelenk simply because their web site has an English menu option which makes navigation a little easier. They are superb items and very well made from a high temp carbon/plastic process.
The part number for the servo horns used on the aileron, stabs and rudder is 992811JR it's a 25mm length arm. I used the 72mm overall length turnbuckles supplied in the kit accessories pack.
I bought the offset ball links a long while ago, seem to remember getting them from an RC buggy shop but sorry do not have the details on these but a normal M3 good quality item should be fine.
I'm just playing with the flap linkage and servo set up now so will post the final details on what is used once this is done.
Hope that helps.
marcs