Be aware the 30 2-speed bridge is the same as the 50 2-speed bridge. Despite different part numbers, and the limited availability and increased cost (about $30-$50 more) of the bridge for the 50 2-speeds, the 30 bridge is the exact same part. This bridge works on 30S, 30SW, 50S, and 50SW models.
Part # 98-50SN (or 3-50S) can be substituted with part # 98-30SN (or 3-30S).
*Note: First part numbers are for 'bushings', second numbers are complete bridge assemblies. First part is priced at $13.80, second at $43.70 at Scott's. Though my local parts distributor has them listed at $24, and $82 respectively.
Good to know. Mahalo John