When I say not the same...I mean by Mazda Part Number, which is physically stamped into the OEM Bilstein Shocks by Bilstein.
In other words Mazda does not recognizes their RX-8 Bilsteins as the same for each Series, just like there are as many if not more (12 different Mazda shocks) for the NC MX-5....when aftermarket says there is only one or two from each brand.
What is the difference, mainly in shock valve and spring rates.
Now will these R3's on eBay fit, I really cant see why not.
Apart from the shocks and springs ..these are the only parts in Series 2 which are different by Mazda Part Number to S1...which are supplied with your eBay set.
TEAM has had experience with these from memory and would confirm if they fit, sorry I cant remember, but I think they will?