The battery I purchased is in an aluminium case but I don't think its a LIFEPO4. I have tried to upload a picture of it but it just won't have it.
Yes I could modify another rack to suit but I thought it would be best to obtain the proper one as it facilitates locking of the battery to it. I have emailed, and telephoned, Alien Bikes numerous times, but to date, without any reply.
Will keep trying though.