Heston 530 vs. 5530

Heston 530 has a filler WA part # 700101702...behind the starter roll on the baler and I have a 5530 that does NOT have this filler plate. Is this factory made or am I missing this piece??
I've had a man tell me that this is hard on the belts because all the weight of the hay is riding on the belt

Heston 530 vs. 5530