If they are N7's then have a look at : <!-- m --><a class="postlink" href="http://www.sparkplug-crossreference.com/convert/CHAMP_PN/N7">http://www.sparkplug-crossreference.com ... HAMP_PN/N7</a><!-- m --> Or you can look them up on the NGK website (yes a 1934 silver eagle IS listed! ) <!-- m --><a class="postlink" href="https://www.ngk.de/nc/en/product-finder/produktfinder/PKW/ZK_BENZINER/ALVIS/SILVEREAGLE/AB6/363/">https://www.ngk.de/nc/en/product-finder ... E/AB6/363/</a><!-- m --> Which then leads onto : <!-- m --><a class="postlink" href="http://www.ngk.com/product.aspx?zpid=9199">http://www.ngk.com/product.aspx?zpid=9199</a><!-- m --> Chris Posted by chhym 25/01/2016 15:04:20