I've had this a few times where I've had a few sets of bolts that share the same bolt size. Where this becomes a problem is when I've got to swap out and/or resize, for example, half of the bolts. I can't do a "Replace All" and the alternative is changing each one individually or deleting out the old size and placing new ones at the correct size.
I think it would be beneficial if you could do a "Select Multiple" like you can with Frame Generator and change the size of only the parts selected. I believe someone posted something similar to this about normal parts but I think I would also like to see it implemented in the Change Size and/or Replace From Content Center windows.
Thanks guys.