tmadden,
From a dimensional standpoint, you will find that most all Wilwood 6P/4P are lug/radially identical from model to model.
For example: If you currently have a SL4 you could purchase the same style (lug/radial mount) SL6 and it will be a direct replacement.
We have "black" SL6R (1.62/1.12 pistons) "radial mount" calipers in stock. They are for 1.25" wide rotor applications if this suits your specific needs.
Jay
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