I have the opportunity to pick up a seven-string Sustaniac pickup but I'm not sure about a few things. Apparently, it's supposed to fit in a humbucker spacing; there's a version with a plastic shield so that the humbucker cavity is totally covered over but this one doesn't have that. According to the sustaniac site, a single-coil pickup can give low outputs if placed so close to the sustaniac and they recommend you use a mini-humbucker instead. Does anyone actually know of any seven-string mini-humbuckers? I can't think of a single one. Alternatively, maybe a stacked humbucker? I'm clueless. Thanks!