Just read through the WB parts book. There are a couple of options for WB bumpers. Normal chrome ones. Chrome with the rubber strip. Plus some listed for Ambulances. However there are another set listed as painted type. I guess these were the Sandman ones as it had painted bumpers with rub strips.
I have seen one set of the chrome ones with rub strips sold on eBay but have you seen the painted type with rub strip Inuendo?