I've a couple of steel bars that you can have, one uncut from a 1990 Fire Mountain (so probably OEM for the Lava Dome as well?) and another from a GT Karakoram of the same year that's been chopped down. They're not mint but should clean up okay.
I've no need for either so I can post them on for a few quid, or you can come pick them up if you're in the area? I remember that you popped around my office to pick up a Karakoram frame a couple of years back and I'm still in the same place. Let me know if they're any good for you