First thing I'd do is contact supplier and see if it is actually correct one listed. Otherwise......
You know how to braze? AC guys (I used to be HVAC/R) use a product called "silfos" brand name for silver bearing-phosphorus brazing rod. It needs no flux on copper. You clean the copper, use an oxy-acet torch and flow it in. If it were me, I'd try and mod the tubes to fit, heat, bend, extend, etc
The sensor you should be able to re-route but be careful, as old as they are, likely weakoned. You can likely GENTLY work something like a knitting/ darning needle through the fins to give it a "place."