T20
NEW ASM TPMX 2807 T20 Insert Clamp Screw (Pk Of 70)
You will see that the 6GK7343-1EX30-0XE0 works without overheating in tight enclosures.
QUANTITY - 4 BUSS T 20 T20 DUAL ELEMENT TIME DELAY 20 AMP 125 VOLT OR LESS
It's exactly 1/4 in, which is what I was looking for in a replacement part.