If you use the oem fw with the rst or rxt the contact area from the center of the inside set of rivets in will not contact the fw. This is almost a 1/4 of the contact are of the disc. Will it work, yes, is it ideal, NO. I bought a used rst that needed rebuilt. Sent it in and had it rebuilt and it came back with a note inside that said Do Not Use With OEM Flywheel, Aftermarket FlyWheel Required. This was because it was previously used with an oem fw and the wear pattern with very clear where the disc was not contacting the fw in the configuration it was previously used in. Like I said, it will bolt to the oem fw, but will not be an ideal application, and a waste IMHO