I have an Andersen E40 / 9#31 8/77. I'm guessing 24-939 is the correct replacement? Will the replacement fit the existing space without modification? (see photo)
In general, with the older boxes, is it safe to assume the number before the # is the weight, and the number after is the length? For a replacement a matching weight and a length equal or greater should do the job?
Thank you,
Thom
