Channel Balance Help

A quick learner from Newark ohio says:

Stamped with part no 2430

Al channel is 25" long. Hook is broken off the end of the spring. Need entire assembly or just the spring?

And I have another pair stamped 1620 with an AL channel length of 17". This is the 1620 but they look the same. 

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Bob from SWISCO responded:

Thanks for your patience during this busy time of the year for us. It looks like you have either an S351-17 or S390-17, with a stamp option of 1620; as well as either an S351-24 or S390-24, with a stamp option of 2430. The only difference between the Series 351 and Series 390 is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. 

A quick learner from Newark ohio says:
Thanks so much!
A quick learner from Newark ohio says:
My base is 1 1/16! Should I go bigger or smaller? Just my luck...
Thanks!
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Bob from SWISCO responded:

These nylon shoes tend to wear down over time. So long as it's greater than 1", I think assuming you have the shoe with a 1-1/8" depth is the better bet--thus, the Series 390

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