I lucked out awhile back and picked up 2 sets for my TD20 and my Sea King. Here is the sellers info.
I just checked and he still has some in-stock. Not cheap, but they appear to be well made and were tight in the bores of my TD20. I achieved proper ring gap with just a tiny bit of filing.
Order soon. They take awhile to get them.
Thx
John Gragg
RIverside, CA
Just starting in the hobby, please be patient.
48 Sea King 5hp GG9014A
49 Sea King 5hp GG9014A
48 Johnson TD20
49 Johnson TD20
54 Johnson QD15
55 Johnson CD12