Right Hand Crank Assembly - Casement Window dated 1966 - 1975

I usually see those numbers associated with our 39-014, but to be honest going by the numbers printed on the hardware itself isn't the most reliable method. Manufacturers change those numbers and what they mean all the time, so there's never a guarantee.

Your best bet is to compare your measurements and style to the information we have on our site. You said that the 39-255 is similar, so I would recommend carefully going over each dimension and seeing how well they match what you have. Also look at our 39-014, just in case. If yours differs in any way, let me know exactly how and we can work from there. Pictures of your operator would also put us on the right track.

Yes, the 39-028 is currently available. However, the 39-028 is an older style that is no longer made. You may want to instead consider the 39-028E, which is functionally identical in all ways to the 39-028. The only difference is the style of the base, which is rounded instead of squared.