gapco window ballasts

Question

i have 1988 vintage gapco windows in my home. a few of the ballast are breaking. various reasons.
i would like to replace them but am not sure how to cross reference them to your part numbers. I have sent a few pictures of the end piecse same on all my ballasts..
i have 2 dirrerent sizes that are needed.

gapco 3044 window (3 ft by 4 ft 4") the metal part is 25 inches long.
the number 2430b is stamped on the metal

gapco 3050 window (3 foot by 5 foot) the metal part is 29 inches long.
the number 2830g is stamped on the metal.

i am trying to go through the windows i have to get a count of how many of each i need. i will probable order a couple spares of each.

could you tell me what part number i need to order from you all?

thanks so much for your help.
Hope you have a wonderful holiday season.

-Tom

Tom · Accepted Answer

Thanks for contacting us. I believe you have either our Series 390 or Series 351, depending on the depth of the bottom shoe. The Series 390 comes with a 15-001 shoe and the Series 351 comes with a 15-002 shoe. That's the only difference between them.