Seca2 voltage regulator installed on my Rz350. The original burned out and the Seca2 one was a drop in, but with fins for cooling. What a pos my Rz was, but it taught me so much I still do most of my basic maintenance myself (fluids, brakes, suspension, etc).
The one thing it completely soured me on is carbs. I swore I will never buy a bike that came with float bowls ever again. That and kick starters.