I have an SLX lever with a broken clamp which I got off here last year as part of a complete brake — I needed the caliper after a brake bleeding session gone sadly awry. I’m not sure of the lever code but the caliper is BR675 which I think is the right era.
The lever is left-hand, but that SJS Cycles link above leads me to believe the lever blade itself is generic. So quite possibly you could dismantle to get the bit you need.
Dismantling, etc, might be too much of a pain in the neck. However, I thought I’d at least offer — so feel free to PM me if none of the offers of levers up-thread ^ sort you out 🙂