for the record, about a month ago i was shopping for a 9" kit. first looked at fort waynes web site, then for the heck of it looked at ebay. i found on ebay the same kit listed by fort wayne for about 30 or 35 bucks cheaper. same part number except with an S on the end. i called to ask whats the diff, he said S means it has springs around the center, while a tractor disk may not. so i asked why its cheaper on ebay and would they prefer to do sales that way. he told me they some times are short of cores so they then buy from china, and thats what you will get if ordered from ebay. i said yeah i would assume you run out of cores as there is no mention of it on the web site. "o no, we charge a core charge!" well i thought what the heck i got him on the phone just order it and be done. kinda pist off, but i got the real deal, made in usa. he called me back an hour later and said" i cant charge you a core charge, your right, its not mentioned on our web site! so, call em up, dont buy the cheap ebay deal!