if going non OE/OEM route- seek to use pieces that look to duplicate OEM design and measurements (if OEM has the rubber bar acrossm that'll be your target)

for a back up plan- if the above choice is not available- try to use as sturdy/heavy/quality do-nut that you can find that will give you the tightest fitting (after installed)

>also, these things are soo cheap, might as well do all the rubber hanger/ attachment/ do-nut(s) while you're under there (excepting those that have been replaced recently)

likely the other do-nut(s) are in almost ready to be replaced condition

-fad