This is what is posted at the Lee site about custom collet dies:
Custom Services
March 17, 2021: Due to unprecedented order volume, we have suspended custom services for Collet Necksizing Dies, Full Length Sizing Die Sets, Quick Trim Dies, Case Length Gauges, Factory Crimp Dies and Bullet Molds until we are able to meet the required volume of our standard products. We do have some frequently ordered custom over-runs available in Quick Trim Dies, Case Length Gauges and Factory Crimp dies in their respective categories.
WE WILL POST HERE WHEN THESE SERVICES RESUME. WE ARE NOT ACCEPTING ANY PRE-ORDERS/BACKORDERS AT THIS TIME.
https://leeprecision.com/lee-custom-services/