My understanding was that the company that bought Black Diamond tooling and rights was a Florida company named "Woods Ready" They will start selling the line again in the next month or two.
Regarding the Old WARN (Black Diamond) coil conversion kit, a club member bought one of the first kits they came out with. We as a club installed it. It was a B...ch to install. Took us a couple weeks. A lot of grinding and welding. The kit is not removable unless the rig is trashed. After it was all said and done he was very happy with it but it did not perform any better than my SOA. (we both have YJ's)The money he spent on that kit could have given him some serious power train upgrades. The WARN kit has its limits, as future upgrades are not there. Since then, I have increased my SOA lift by 2" and gone to 35" tires. The same tires on his rig would stuff the wheel wells.
My opinion (which is only important to me) is to stick with your SOA and use the money for a power train upgrade.
'91 YJ, 4.0L 5sp, Atlas II, RE SOA + 2"BDS, 35" Explorer Xterrains, ARB's & 4.56 gears, WARN 9000i