Safe to use Wheel Adapters 5 on 4" to 4.5"?

67DodgeDart360 said

I own a 67 Dodge Dart. I want to change my bolt pattern to 5x4.5” to be able to buy different rims. Are Wheel Adapters 5 on 4" to 4.5" Safe to use? Here is the link New Pair Small to Big Bolt Pattern Mopar Wheel Adapters 5 on 4" to 4.5" Dart SBP | eBay

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Not that particular pair. Those are cast, and have a tendency to crack because they're too thin.

Spacer/adaptors like that can be safe to use, but I would always use billet. The billet spacers are typically more like 1" thick, so using them for converting to BBP is problematic because of the backspace needed. Unless you're using 17" or larger wheels.

Like these
1" 1960s Mopar Chrysler 5x4 to 5x4.5 WHEEL Billet Adapters SAE 1/2x20 studs/nut | eBay