I need help to ID a part that feel to the floor

Hi, while removing the front dryer panel a part feel to the floor without me seeing were it was attached to the dryer. The part is a small black box with no top and slits cut into the sides. I think it is used to cover some wires but am not certain. the breakdown diagram on for the front panel does not show it. any one have any ideas on where it goes on my dryer?
next question is , i am replacing my drum support bearing on this dryer and do not know in which order a apply my new dryer drum slides (2 white and 2 green). My old drum support bearing was so worn that it nolonger had the drum slides attached so that i could see the order in which they were attached.

Thanks for any help you might be able to offer.