Sorry, but the Master Parts Catalog doesn't appear to show any parts for the distributor except the adaptor, cap, diaphragm, and rotor assembly.
But, I think that is a standard sized bronze bushing. So I'd use some calipers and determine the ID and OD of a needed bushing and just order one. You might have to cut it to length as they come in standard lengths.
Gary, AKA "Gary fellow":
Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI