C. F. Keil and Franz Delitzsch on 1 Kings 7:16

1Ki 7:16 “And he made two capitals (כּתרות), to set them on the heads of the pillars, cast in brass, five cubits the height of the one and of the other capital.” If, on the other hand, in 2Ki 25:17 the height of the capital is said to have been three cubits, this discrepancy cannot be explained on the supposition that the capitals had been reduced two cubits in the course of time; but the statement rests, like the parallel passage in Jer 52:22, upon an error of the text, i.e., upon the substitution of ג (3) for ה (5).