Are you referring to the ABS unit? If so, I don't think you can make that swap without some significant re-plumbing and changing the ABS control unit. The '89 - '92 SC's have the Teves Mark II ABS which uses an accumulator to provide system pressure. The '93 - '95 SC's have the Teves Mark IV which uses the engines vacuum system to control the ABS hydraulic pump.
Other than the fact that the accumulator causes some age related problems, is there a reason that you would want to convert?