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It depends on the vendor. Many vendors will supply a "kit" that is just components assembled from parts they have on their shelves, and yes, if you ask, they often will simply substitute the components you want.

For a 1990 Outrage 19 with a BF130, I recommend either a surface mount 2.0 SeaStar helm with a front mount SeaStar cylinder with SeaStar hoses *or* a 1.7 SeaStar Helm with a BayStar cylinder and with SeaStar hoses.

The latter combination will speed up the steering response to just a little over 4 turns lock-to-lock which is about the same as the 2.0 SeaStar helm with SeaStar cylinder.

Honestly, after upgrading to the better hoses, I don't see much advantage to using a BayStar cylinder at all.