Transmission line speakers

Hi all.
Trying to do up a pair of transmission line speakers iv had for ages. Have the kef b139 bass cone a seas tweeter and used to have a audax mid which I believe was put in instead of kef! 110.
I have put a peerless in but find them to bright a don't think the peerless match.

Could someone help me to improve a get some new cones and may be upgrade the crossovers.
Many thanks Justin
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