Need help identifying a 15 inch block/tackle balence.

A quick learner from Califoornia says:
September 13, 2020
I'm happy to give additional measurements as needed. The calipers are very cheap and I only used them to get a rough estimation.

This came out of a small-ish window. The cord frayed and broke off of the hook/clip that kept the balance anchored to the frame embedded in the wall. The aluminum channel is 15 inches long, 1/2 inch wide and about 3/4 inch deep.

The markings:

1420 (weights, i think)
BSI (manufacturer?)
AL (Aluminum, i think)

It looks like a 15 inch block and tackle style with a rating of `1420`, but the plastic ends are what I'm having trouble identifying. They don't seem broken, so can I just move them to the replacement? They don't appear to be riveted in

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Casey from SWISCO responded:
September 16, 2020

Hello,

Take a look at our S395-15 channel balance with a 142 spring strength option. These balances come with the attachments already installed, so no need to save the originals. Thanks for posting! 
15" Series 395 Channel Balance
15" Series 395 Channel Balance
S395-15
$9.34
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