Once you fix this plan, then please let me know soon because we need to recheck with them 2 points;
(1) As an opinion of manufacturer side, if REC can be used for the same application of 4YG.
(2) If their production capacity is OK when REC is replaced for 4YG, because your monthly average of 4YG consumption is about 50,000 - 60,000m in total of all resistance values.