Heavy Duty Bumper.  The mounting holes are for 4-40 Screws 3" apart.  Holes can be drilled larger to fit older chassis plates.  This is the stronger 2.5mm thickness.  I am suggesting using aluminum screws to mount the bumper so they break before the chassis or bumper.

2.5mm Heavy Duty Bumper (4-40 Screws)

SKU: MR0204a
$18.00Price