Having the earlier 1310s or changing to them is always a great idea as they are extremely common in North America.
The later 5-4x is very rare in North America. Best to get them out of the UK. RTC3458/TVC100010. My own experience is that the non-greasable GKN joints last the longest.
Pissing people off on the "net" since 1983.
Land Rover. Turning owners into mechanics since 1948.