I’ve had this loads of times, not sure how these poles are cut to size as they’re all hit n miss but generally I’ve found with gardiner poles is to look up the base and just see which section is longer and use a dremel or fine hacksaw and cut the section down, I’ve had it sometimes where I’ve had to cut not just the bottom section but the next one up too so it sticks out just about right to get your female rectus on.
It can be nervous cutting a brand new pole if you haven’t done it before but wrap the piece your cutting in masking tape then cut and you’ll be reet!!