The part number you have is for a ''78-79 Invader only'' track drive bearing. It comes as an assembly with a collar 92027-3502 and a set screw 92009-3526. Like Gixxer6 mentionned, it is cheaper to go through your local bearing shop (if they can match it) and if the quality is at par with the oem bearing....
Tolerances and quality from certain ''foreign'' bearing companies are to be questionned sometimes....make sure you you get what you pay for.....just like oem parts...
It is true that ''sometimes'', aftermarket is better than oem.....but that's pretty rare....unless you pay an arm and a leg for the part....nothing beats mass production as for cost...
I also hate paying the high prices of certain ebay sellers not to mention the shipping charges...but when ''your'' desire is to have exactly what the original ''maker and designer'' of the machine created....that's one avenue that reaches people across the planet like no other..........because up here in Canada, compared to the US, we have nothing close to what is available ''parts wise'' for vintage sleds and when you can buy a part from the comfort of your home without travelling 2000 miles to get it......well you pay the price and the shipping charges...
Take care