I've not run into that, but have heard that others have had similar problems.
Have you seen this thread:
Transmission cooler connectors [E2TZ-7D273-A] - NOS? I don't know if they might help, but...
Also, I've had absolutely no joy from Inline Tube. I bought stainless brake lines for Dad's truck from them and NOTHING fit. I will not buy from them again. Having said that, I don't know that their transmission lines won't fit. I just don't believe in Inline Tube.
Gary, AKA "Gary fellow":
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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