I made and fitted some spacers today
I ordered a 19mm dia tube with a 9mm hole from Amazon. Measured the space for the spacers as 31.5mm left side and 28.5mm right side. Measured exactly and very very carefully cut the tube as straight as I could. I only have a junior hacksaw but aluminium is nice and soft. First cut was just about spot on and just needed a tiny bit of dressing with a file, the second cut though had gone a bit awry fortunately to the large size so a bit more time with the file had a nice square face. I also found some nice stainless Allen cap head bolts of about the right length added a spring washer to each and woo-hoo it bolts straight on and is a perfect fit.
The rack has a bit of rust around the top bolt brackets so if it bothers me I will get it re-powder coated and will get the spacers done at the same time.
I also worked out how to mount my Kriega bags to the bike. I removed the little luggage bobbins under the mudguard and added a short length of folded over 1” webbing strap with a suitable hole melted through for the bolt thread to pass through. Refit the bobbins with the little loop poking out to the outside of the bike. Very discrete. Now mount the bag half on the pillion seat half on the rack and clip to those loops. Tighten and you are away. I also found an old Kriega tank adapter and that’s an easy fit with a self made loop in the straps that go under the seat - loop back on itself to the seat subframe each side and refit the seat. The other end is a simple long length of webbing looped under the headstock. Pull it all tight and straight then clip on one or other of my Kriega bags. It looks very neat.
I took it all off before coming in from the garage and forgot to photograph. Next time I’ll get some pics though.