ok , your wording convfused

BTW the B16a ratios are exactly the same as the B16b gearbox.
1st: 3.230
2nd: 2.105
3rd: 1.458
4th: 1.107
5th: 0.848
Reverse: 3.000
Final Drive: 4.400
Only diffference is stronger(dual synchro) 2/3/4 gears and LSD.
Your ITR box has slightly different ratios -
1st: 3.230
2nd: 2.105
3rd: 1.458
4th: 1.034
5th: 0.787
Reverse: 3.000
Final Drive: 4.785

If its cheaper , then get the CTR box you described.