I am pretty sure it is a direct swap, my brother has an 89 RRC and somehow the 14cu got some codes burnt into it that we couldn't erase, so he swapped it to a 14cux and it has run fine since.
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1991 RRC
2 1989 RRC's
1998 RR P38A
1967 SIIA 88
1969 SIIA 88
1967 SII 109
1971 Vampire Radio Body 101FC
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