TM11-854, pg 86 E149, - E157 Core, adjustable tuning: 3 13/16"log o/a x 0.256, tunes coils L014-L113 that should answer the question on the RF coil slugs E144-E148, Core, adjustable tuning: 3 7/16" x 0.25" tunes L102-L118 E142,142 Core 4 9/16" 0.255 tunes L101, L110