I have been using the one piece CVD Hardened Universals which is a one piece unit. The part number is ZS-010FH and requires the ball end to be ground down for fitment into the one-way cups. Replacement hardened Universals for both the front and rear are also listed on the Yokomo web site under new products and can be seen by using the link on agowers post thread 14437 page 482. The part number for the Hardened Universals are SD-010FH and SD-010RH and are sold in pairs.
I purchased my Hardened Universals from Hobby Habit South Australia. These are definately worth purchasing.
I was having the same problems with the pins coming loose and also not being long enough.
A picture of these Harden Universals is shown on page 481 Thread number 14428.
Hope this helps.