For anyone interested in the custom rollover hoops, I have included the dimensions I used below.
I had them made by Tom Wood, at Tube Bender.
Website:
https://tube-bender.co.uk/
Email:
tom@tube-bender.co.uk
Spec: 38.1mm OD x 2mm Wall x Stainless Steel x 240mm centres
Cost: £87.50 + £15 Delivery + VAT, about £120 delivered.
They are smaller overall radius, but the stainless steel is considerably thicker than stock and ebay aftermarket ones.
Here is one fitted through the 'washboard' style parcel shelf.