Thanks for reaching out to us! I believe your bifold pins may be 1/4" in diameter but I recommend checking to be sure. If so, you can use 21-066 top and bottom spring-loaded guide pins. For the bottom corner adjusting pin, you can use the 21-003. The nylon pivot block, we believe, is the 21-210. For the top corner spring loaded pivot pin, you will need the 21-026B, 1/4" plain pin with the 21-250 spring and two 21-155 push nuts, one for the top of the pin and one to lock pin onto the door for the bottom. You can use your old parts with the new ones if they are still good.
