I knew LowBrow had discontinued the bearing conversion but I thought one of the Brit parts suppliers still offered them. At any rate, great score. I found the LowBrow customer service to be the best.
73 and later narrow glide hubs with 3/4 axle. Superglide and Sportsters, some FXRs used them. Single or dual disc hubs are plentiful as are complete wheels. Face Book Market is usually a cheaper source than EBay.
New spokes and new rims can be had pretty cheap at BMIKarts. Look at the vintage motorcycle section. The stock rim is a 19" drop center.