Strut boots and firing pins do not match OEM spring case. No force, no heat, no lubrication could make them fit into the housing over the springs. Since my OEM fender (rubber element) was cracked I just took a knife to shave the edges of the KYB to make it fit until I could order an OEM. For the price, I suggest just buying the OEM strut boots/bellows and fenders. These bellows are also shorter than the originals, so have a little less "protection" from dust and dirt.
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