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The fittings on the evaporator are different from 86 to 87, so you'll need an 87+ evap with the correct lines to make it simpler, plus the correct lowside pressure cutoff switch for 134a vs R12.

The firewalls are the same - there is a blank cover over the air box closing off the evap line openings. There sometimes is a difference in compressors on factory AC cars vs dealer installed AC. The stock Denso compressor isn't really good for 134a as its lubrication sump tends to allow the oil charge to pool excessively at its lower piston bore, plus the original R12 condensor tends to have the same problem with oil settling, since 134a doesn't dissolve oil like R12 does.

You're better off with the Sanden compressor if you can find a kit with it instead of the Denso. Its much more efficient with 134a and keeps the high side from running away in pressure from 134a having the tendency of operating under super heat condition in an R12 fox AC system.

Original Air sells a kit - part number 23-106 with a modern style rotary compressor and it uses the stock style Denso mounting brackets, so you'll also need the factory serpentine bracket from an 86+ fox. Makes sure to use the correct viscosity and quantity of oil the new compressor calls for.
 
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