I am needing to replace the pickups in a Warwick Thumb 6 BO. The bridge pickup is not functioning at all, I took it into my local tech and he said the circuitry looked fine but the pickup measured as dead. I'm looking into what my options are, but I'm a bit unsure what exact pickups will fit. I'm not very familiar with the soap bar size and apparently theres lots of different dimensions available. Right now I'm leaving toward Aguilar, as I've heard good things about them in Warwicks. The correct pickup would be the D4?