Ta guys, sealmate etc won't work. The tubes were removed and cleaned and the spots can be seen plainly on one and faintly on the other. Looks like a brass finish underneath the chrome.
Maybe I needed to use the seal mate earlier and cleen out the grime.
Might have to go back to the ole us of a websites and track down a cheap set.
Can't take it off the road for two to three weeks to have em rechromed.