Yes you are right.
So from inner to outer:
1/ custom ring : 52,3 mm (axle housing) x 55 x 54mm (axle housing length)
take, check, verify your own measure, depends on you axle condition
2/ inner ring 55x62x38 + 55x62x16
"1 and a half" : you have to cut a 2nd inner brace to reach the 54mm...