I have one of those modern US Gibson Thunderbirds and I would like to try more vintage style pickups. Is there anybody who produces Thunderbird pickups the original way, that means bar magnets inside the coils (as opposed to magnet on bottom and passive blade "polepieces" inside the coils)? The Lollars do, but I hesitate to fork out $400. Are those passive EMGs OK? What magnets do they have?