I purchased the guide blocks from the Ebay link listed in the other post reply. Be careful that you do not twist or have the top lower down at an angle from one end to the other otherwise they will snap in the center. Order extras just in case as they are fairly cheap. Not difficult to replace but more work than you think. As for the pads that set down on the frame on the outside edge, I saw a post in a different thread that said to use hockey pucks as they are solid rubber and will not Smash and wear out as quickly as the originals. If you don't want something that large, you can always cut the tread off of a rubber tire. Good luck.