Not stronger?
The associated part is much stronger, especially now the B4 part has superceded to the B4.1 item.
I gave up running the schuey parts and now only use the associated item as they are so much better, not to mention half the price!
Regarding installing the B4 part, all you need to do is use a 4/40 bolt with a long shank to pass through the carrier (b4 gearbox screws work well) and then thread it into the lower part of the carrier. (You can add a locknut but its not really needed)
This way they are pretty much a direct replacement. (you can also machine a small section away for more lock if you want, but its still a very minor mod)
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