Thanks guys, very kind offers indeed.
Let me see what's available here, I've made no enquiries at all this end yet, I only know I need something to raise the effective bump-stop level at the front by about 1".
The front tyres are just catching on more severe 'dives' into hollows or depressions, nothing serious... Yet!
Ironically, the rear stops have been missing altogether for the last 10 years, but I get no rubs at the back!