Who replaced the drum for you?
I dont suppose you have the part number do you? If they left you any paper work it could be on there.
Ok i assume you was just concered about the drum then.
What they have fitted is correct. As the new lifters inside are now smaller then the old ones and a different design so thats normal.
What it was the old bigger plastic lifters in the drum used to break for fun. So they redesigned the lifters and what you have in the new drum is the new version lifters so thats correct.
On moden washers you can no longer replace the bearings as they use welded drums. They are factory welded so you cannot replace just bearings anymore so a complete new drum now has to be fitted when the bearings fail.
It wont be a cheap imitation as no company out there makes none genunine drums as the cost it will involve to make them isnt worth it. So whenever a drum is replaced it will always be a genuine drum made by Whirlpool.
Just wondering how you got on with the appliance as the question is still open?
Do you still need more help on this? If so then just get back to me. If not then if you could remember to rate the answer that would be great.