Hi firends. I am about to convert my system back to R-12. (I am referring to a 350SD, 1991). The only part I still need to get is the filter drier. When I went to the autopart to get some prices, they told they have 2 choices. A replacement for $45.00 and the original for $100.00. Does anyone have experience with the replacement? Will this perform poor or marginal? What would be your choice? Thank you in advance for your opinion.