Yes, that does look like an optional item. Why do you think it is needed?
I understand why they are saying it is required. But I’m not convinced that it is. My last retrofit roller didn’t require that or even a mellonized distributor gear. Either way, I don’t like it.
EDIT. Reading through Grumpy’s links most hydraulic roller cam manufacturers now press on a softer metal cam gear so you don’t need to replace the distributor gear.
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