Hello, I am not sure that the old box will accept the new evap, the old evap is controlled by an expansion valve and the new has a high to low side orifice under the frame rail before the condenser, plus the hose connections are different. I did it to my 89 240 because it was a rust free gem and I had just taken out a telephone pole with my 92, 240 wagon so I swapped out everything from the 92 to the 89. Now I have a 92 89 5 speed with air bag and ABS. From start to finish it was a 13 day project.