there are usually plastic posts that you'd need to melt to be able to secure them, you'll need to snap off the old ones though.
They're kinda like rivets... except the melting part

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project