My advice is read the reviews online about the slide in general (quality & fit and finish) place the order, if they can't or won't ship it they will just cancel the order, your card is not charged till it "ships"
CBSA will spend about 6 months deciding on what to do? and thein finally release it. Enjoy & good luck.
BTW, there are lots of "threads" here about WTF is going on @ CBSA, find a good chair and get a beverage and start reading. My advice if it ships? which it should, wait a reasonable amount of time then call the 1-800 # and leave a message at the postal facility, and in the message, "try and be helpful to the poor confused CBSA agent" remember he's protecting Canada. They should release it in a reasonable amount of time, hopefully.