Per TM 9-2320-361-20, Sec 7-6, step #8, There is no gasket or sealant between the the two. Mine had no gasket or evidence of sealant when I disassembled it.
Both are the same per TM 9-2320-361-20, sec 9-5, step 2
"2. Turn wheel, tighten inner adjusting nut (3) 50 lb-ft (68 NŽm), then back off...