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39-139 Single Arm Crank Operator, 9-1/2"

Hi, I am looking for the hardware for my 4300 Designer Series Casement windows made by Acorn which I understand is out of business. I need roto operator assemblies, cam action sash locks and cover plate attachments. I have part numbers if you need them

I have the same model as the 39-138 and 39-139 but the arm is 1.5" longer (11") instead of 9.5". Do you have the longer or does it really matter? Does the 391xx come in different colors or just the white?

Casement Window Operator Arm is about 9-7/8"

I purchased this item to replace an existing bent crank with missing screws. What size and type of screws should I purchase to install this item?

Which is the right channel guide to go with the 39-138 and 39-139?

What is the spline size of the item 39-139 casement operator? I am looking for this type and find 5/16 splines but can't find a matching set of an operator and folding handle. The folding handle #39-205 at 11/32 doesn't work with 5/16 operator, as it strips out. Thanks Steve

The 39-139 operator arm measures 9 1/2" in length.