Easy roll have discontinued stocking them which is a bugger. The explanation was there just wasn't the margin to handle them. They were very good with their service and I still get my steering head bushes through them.
I haven't bought wheels for a few years and they were much more expensive than that I reckon Stephen.
The 6005 2RSH SKF Deep Groove Bearing - 25 x 47 x 12mm will go straight into the fallshaw wheels. You will just require the "thinner black adapter",
I hope the width of the total hub is the same to retain the wheel on the axle for your design. From memory they end up 108mm wide.
The 6004 that we all use are 20x 42mm OD and 12mm wide and use a thicker black adapter in Fallshaws.
Hope you get it sorted as it all gets pretty confusing.