I bought this along with the 7424 thinking it was OEM and a proper accessory.  But I just thew them away once I got one of those Velcro backing plates.  Using an aftermarket Velcro backing plate opens up so many different options.  I just can't see myself buying bonnets and using this foam disc anymore.  I'm not even sure why one is included with the buffer.  Why not include a Velcro backing plate instead?  I bought 2 of them not knowing it would come with one also.  All 3 went right into the garbage can upon getting the Velcro plate.  Sry to repeat that so much...  cheers.