Kirk Kelly has Sporty Specialties in California. However I see these rod sets everywhere. Ebay. Don't know if the same but many available. 54 and up. The proper way to resize rods and races is to lap them until they are ROUND. Than measure to find the next oversize roller. Than lap to the next size. Measure a lot.
No mix and match and try different rollers. Harley case races and rods wear egg shaped due to power pulses and must be made round again during rebuild. All new races must be lapped to insure roundness. After installing they may not be round due to pressing in hole or mfg differences.