I have a set in my Orville '76 clone, in Greatdealz67 NOS covers. They're fabulous IMHO. Pickups ( the sound that is ) are highly subjective, but these have the right amount of " growl " to my ears, although I find them much more sensitive to height adjustment ( distance from the pickup to the strings ) than the stock Orvs. I believe DrBassman has a set also. Seymour winds them himself ( mine are signed ) and it took quite a while to get them. If I had any complaint about them it would be that they were wired with a " modern " four conductor wire and not the vintage braided wire ( to be fair to SD I didn't specify vintage wire ) but it seems a little odd to me to do a vintage pup and not use vintage style wire ( although you would certainly have more wiring options with the four conductor wire )
S.
I have 3 of them. One is in my 60's NR restoration project and it is the best sounding bass I own IMHO. The pup is very strong, great lows and well articulated highs. It really works with the solid mahogany body. These aren't cheap but they are one of a kind pickups you just can't get anywhere else. The covers are from Overdriven66. Tony has these made by a machinist and they ain't cheap either! You'll pay $160 or so just for a cover before you send it off to SD. Then they charge about $150 to create and install the custom pup into the cover.
Expensive? Yes. And worth it for these particular applications.
The next set will go into this project and I can't wait to hear them!!!