channel balances

Thanks for your photos. Based on what I see here, you have either our S380-30 or S385-30, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S380 and S385 balance shoes.

Sure, if your old stamp is 29-4 then you want the 2940 stamp option.

Also, removing these balances isn't as difficult as it seems at first. It may be something you want to consider just to save a few bucks; hiring professional help can be expensive. The video below will walk you through the replacement process step by step. 

You should do whatever you're most comfortable doing, of course. This is just something to keep in mind in case you wanted to pursue another option in the future.