Louisiana Pacific Casement Window Crank Assembly

I have 18 Louisiana casement style windows in the home I built in 1987. I have two gear assemblies which no longer work. It isn't the small worm gear just beneath the crank handle. It is the gear assembly which the crank and worm gear turn to open and close the windows. Where can I find parts?

There are both left and right crank/gear assemblies. I need two lefts and one right. Here are photos. Note, it is not the worm gear which is bad. The crank gear housing boxes are cracked/broken.

Thanks!

Thanks for getting back to me Bob. I hope these pictures help. You can see the crack in the window crank assy gear box and you can see that the linkage attaches to the bottom of the window itself by a simple slide catch clip. If you want measurements for the assemblies I can measure both inside the housing beneath the wood and the interior portion of the crank assembly which is inside the house. It appears to me that the crank assemblies are held into the window via two #2 phillips screws.

Bob, here are a couple of more pics for you to review if you'd be so kind. The arms on my operators are slightly different in length. Not really sure how that would throw off the geometry...The arm with the gear as you can see by the marker on my ruler is right at 4 3/4" from the worm gear(where the handle mounts) to the hole for the pivit of the second arm. The second arm you drawing shows 3 1/8" but mine is 3 1/2". IF these will work, I do not like putting my credit card number on the internet. Is there a number I can use to call in my order.

IF they will work I will need one left handed operator (handle mounts or right side of operator facing it inside the house and one of the handles 39/388 in BRONZE.

If the photos and measurements I sent you will work, that would mean for starters I'd need

39-388 Operator

39-1446 Handle (Bronze)

If this one works I can then replace the remaining 2 or three which are bad or going bad.

Thanks!