I ordered two covers from my measurements provided for my Schroeder SP12's. When they arrived, I gave them then once over, put them on the cabs and left them for a while. Needing them for a rehearsal, I tried to pick them up and found that I couldn't get my fingers into the holes to grab the handles.
I got straight into the phone and spoke to Bryn (one of the owners). He couldn't do enough to help me. As agreed, I sent them both covers and they were returned within days all fully adjusted. A couple of days later I received a cheque in the post from Bryn to cover my postage costs sending them back!
Based on this experience and that if previous, I think they are the best product on the market. Get in touch with them and no doubt they'll put you right.
I'm in no way affiliated, related or whatever to them.....