11-1/4" Operator arm length is not a match

I am pretty positive I need 2 -(left and right)Truth window casement operator parts #39-027E. Here's what I need to know before I order. On YOUR measurement for the single arm in a part photo, you have 9 1/2 inch arm. In YOUR measurement drawing in one of the actual photos, it says 9 1/2 inch arm from roller to middle of gear connected to operator. Is this a typo, I hope? On my arm, it is 9" from the roller end to the end of the arm before it makes a bend going to the gear. If I measured from the roller tip to the spot in which your drawing shows, it would actually be for ME, 11 1/4. If you could please call me or write back, I sure would appreciate it!! I have a ton of stuff I want to buy from you. I have 4 windows in all that need replacement parts, screens, etc. Thanks!!

Thank you for all your help! I have a handle on this now, (no pun intended!)So, for future customers who may have the problem I did, 11" arm that is no longer made, you CAN use either the 9 1/2" arm, or, the 13. They will both fit, as long as your operator gear box is the same dimensions as your old one (which Swisco's part is) AND, your track is long enough to accommodate the 13" arm. In my case, I will go with the 9 1/2" arm, because I see no need to change my track, and the window will still open to a 90 degree angle. Thanks again Jody!!