Not sure. When I did mine I opted for cast iron slave cylinders as my thinking was based on hardness/longevity. The near side front corroded and seized within 12 months. The only local supplier sorted me with an alloy one and that’s been fine for two years. In the mean time the other front iron one began acting up and I’ve had to strip that.
As suggested countless times on ere, make sure you pack the dust covers with pink grease once fitted. Helps keep that salt spray out.