For those of you wondering, my replacement part from Lego arrived in the mail yesterday. And… it’s the wrong part. The set requires two of the lower part and two of the upper part, and it came with three of the lower part and only one of the upper part. They sent me another lower part. The only good news is that if I ever BL additional track parts to expand the coaster, I am now $8 ahead courtesy of Lego’s errors. Another replacement part shipped today, and I checked the numbers in the confirmation email this time, and it appears that I’ll be getting the correct part.