PAIR OF POLYURETHANE SPRING INTERLEAVE PAD - As you probably already know poly makes a more effective and longer lasting bush than rubber (to find out why do a google search)
If your spring is a little saggy then it likely needs re-bushing. We have had better results overhauling original springs than buying new ones as the new ones seem inevitably to be made of thinner metal on the leaves and/or not tempered properly. To overhaul: dismantle spring, send the leaves for shotblasting or attack with an angle driver mounted wire brush cup, repaint, replace the bushes, and reassemble.
You are buying a pair of inter-leaf bushes.
Correct factory fit for:
TRIUMPH SPITFIRE MkI, II, III, IV & 1500 ; YEARS 1962-1980. 3 pairs required
TRIUMPH GT6 MkI, II & III ; YEARS 1966-1973. 3 pairs required
TRIUMPH HERALD 948, 1200, 1250 & 13/60 ; YEARS 1959-1971. 4 pairs required
TRIUMPH VITESSE 6/1600 & 2 LITRE ; YEARS 1962-1971. 4 pairs required