Are you looking at
this one?
As far as I know
SeeBef ordered a Showa 52400-MFA-921 from Italy off eBay for his SC58 CBF1000, as is often the case with newbie questions/problems they never report back, so the assumption is all was well and good.
According to
MotoFaction 52400-MFA refers to the part and model numbers, so on that basis 52400-MFA is a rear shock for a SC58 and DO1 vs 921 means it was sourced through a different supplier.
The ebay advert specifically states it is for SC58 CBF1000's so if it isn't ask the sender for a returns label and return to sender for a full refund of the purchase price and postage costs as per eBay Terms & Conditions.