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Hopefully someone with some expertise will respond, but in the absence of actual knowledge, I just looked at the kit in the catalog that includes: new receiver drier, new O-rings, a capacity label, and a set of R134a valve adapters.
That kit, plus refrigerant, the proper oil, solvent to flush the old oil out of your system, and a vacuum pump to pump the air out before refilling, should work, but that is the absolute minimum parts you could change. The minimum requirement is that you have oil that is compatible with the refrigerant, and O rings that are compatible with the oil, and a new receiver dryer whenever you open your system.
Because R134a has different pressure/temperature characteristics, I would have expected to need to replace pressure sensors, the expansion valve, and possibly the compressor. That, however, would more than double the cost, so you would not want to do it unless it is truly necessary.
In general, an R134 conversion in an R12 system will not be as cold as an R12 system. With just this kit, I would expect it to be significantly less cold than the original R12 system. However, I have not tried it, so I am speculating here. It may be just fine.
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