Semi Truck Windshield Wiper Linkage Bushings

I paid over a $200.00 for replacement of wiper bushings. The Dorman assortment package was all that was available for my part number 49440. My mom had replaced them previously. About three light showers later, they were broken again. This time I replaced them my self. No easy feat when you're 4'11 I might add. I got the single packet this time, it hasn't rained yet so we'll see. I went online to learn how to do it and found out many people complained of the same problem. I have had trouble finding any other brand to try no matter which auto parts store I try. You might want to look into this online, youtube has videos showing how, also complaints about the problem. They aren't expensive, but replacing them is a real hassle for me. Marcia Ragland