Just tried that link and it says product not found or something, yet I remember seeing the 8x6 listed for the Sovereign on there a few months back. It appears the mystery continues here, as to if this coil was ever or is now made for the BBS units. I've heard some say it is, and I've heard some say it never has. Somebody on here I think says they did indeed own one for their Sovereign if I remember right?
The other unicorn is the 6" (not the 5") Excelerator. I vaguely remember seeing that size listed on Kellyco's site a few years ago but couldn't be sure, but recently somebody confirmed to me that they did indeed sell the 6" Excelerator for the BBS units at Kellyco at one time back then. I've looked on the UK forums trying to track down field reports for the BBS units with this coil, as it seems the Detechs are a bit more easy to get from various sources over there.
Can't find any field reports of it for the Sovereign though, and don't think I ran across it listed on Detech's or any other site for the BBS units, so it must be a very hard beast to track down. I've been interested in trying one based on some FBS guys loving that as their trash coil, more so it seems than the 5" Excelerator and a few other small trash coils it seems for those units.