tchuck that makes sense..but in this case....R1 does get their blanks and rotors from centric. If you go to your actual application on the R1 website...they actually show the diagram and stats for each rotor from the Actual Centric website. Why would they do this? The exact same measurements? The exact same part numbers from the R1 website and the Centric website? AND THE EXACT SAME DIAGRAM.
I actually ordered the Eline rotors from R1, and what came to my door is engraved 121.42080(04 FX35)....the exact part number from the centric ctek. IF R1 had done these...it should have been engraved EOE.42080 according to their part#'s. Also, it arrived in the exact box as described from Centric on their website. The slotted and drilled elines are probably cut by R1, or requested to have a certain pattern by R1 to centric, out of the centric rotors. Same as the Premium slot/drilled are cut out of the 120.42080(04 FX35) Premium Centric rotors.
R1 is located in La Habra California. Centric is located in City of Industry California, approx only 8 miles from each other. R1 orders orders their rotors from Centric.
R1 E-Line = cut from Centric C-Tek
R1 Premium = cut from Centric Premium
From the R1concepts website...R1 Premium OEQ Blank spec sheet image for POE.42080:
Centric Premium Blanks

from rockauto.com cant login to centric right now)
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[TD]Premium Rotor-Preferred[/TD]
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[TD]Centric premium rotors utilize an Electrocoating finish that provides long lasting corrosion protection. E-coating is a superior electro-statically applied finish designed to withstand 400 hours of salt water exposure without rusting.
Double Disc Ground-
Centric premium rotors feature a double disc ground, taper free finish. Double disc grinding ensures parallelism, eliminates run out and provides near perfect disc thickness variation (DTV). Double disc grinding leaves a non-directional finish on the friction surface area for more effective pad-rotor break in. This special finish also provides quieter and smoother stops.
Machined Finishes-
Centric premium rotors feature 100% fully machined finishes on all critical and friction surfaces. This extra process provides better rotor balance and creates a cleaner, more finished looking component.
Split Castings-
Center-split core castings provide proper heat transfer and thermal efficiency, resulting in superior braking power and safety.
Mill Balancing-
Centric Premium brake rotors are mill balanced to a tolerance of less than 2oz. per inch. This additional machining operation reduces feedback associated with rotor vibration and provides a smooth confident application of braking force.[/TD]
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[TD]CENTRIC Warranty Information
90 days/3,000 miles
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Sorry, I know whats going on here..and I hate that I overpaid for these dang rotors that were called "ELINE" when they are in fact "CTEK" and I coud have gotten them cheaper.