The bolts are HT , 7mm sleeve and 6mm thread , and all that is available (according to the guys in the know)

is 6mm or 7 mm.
Don't have a choice, I snapped 2 bolts off and had to pay R340 and then another R150 to remove the second broken bolt. So getting the lifters at a good price is now costing another grand.
I supose it is par for the course. You can't win them all.
It beats the hell out of 1 of my camshafts flying out through the bonnet oneday !
By the way , all 16 lifters from Alert is R1039.68 inclusive. Speak to Alvon Carstens. Just ask for the 1.8 16v Sentra (CA18DE) lifters ,it's the same thing. I have heard from some guys , that the quality will probably be crap , but that is an old story. The stuff gets made to SABS standards and I had allready put 4 in 5000 kilometres ago and they are still fine.