Also FYI, the 70-72 front bumpers on the USA 914s were the same as the Euro 70-74 ones (both chrome & painted), as the front bumperettes only applied to 73-74 USA 914s.
So you really only need to find a good 70-72 chrome front bumper 914/4 or -6.
Check the classifieds, TheSamba.com & eBay if the ones above don't work out, as I've seen some recently for sale in the last few weeks.
Make sure you get a quality chrome shop to do a good triple-chrome job on them - copper-nickel-chrome plating, with enough copper laid on & properly smoothed/finished to get that good shine!