cone method, HF sells a black funnel that works, had to cut it just a bit.

heat the boot in water to soften it up, lube up the cone,
do NOT have any grease on your hands and push the boot straight down using your weight and it works fine. If you get any grease on your hands it gets a lot harder cuz of the slippage.

I used the dorman ones

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1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI