You can trust JR, I have had quite a few bits off them for my previous cars, and i have had absolutely no problems.
I have got an 18 year old k11 with 18,000 miles on the clock and the cv gaiters are a little perished but not leaking, i will be buying new ones soon from JR.(y)
Sorry for resurrecting an old thread but, just thought that i might add my bumpers and handles were very faded too, but i have just brought them back to life with old used diesel engine oil!! works a treat, apply with a cloth and buff off with another cloth. simples.:)