I used the Energy Suspension 9.8105RC, which have, I think, an OD of about 1 inch, and an ID of about 3/8. These worked OK, but for the front end-links (I resused the Toyota endlink), I needed to shave down the height, b/c otherwise you can't stack everything and have it fit on the endlink rod such that you can fit the nut. Oh yes, remember not to tighten the nut too much - otherwise the endlink will snap under load.

1999 SR5 V6 4WD
Addcos, Bilsteins, Detroit Truetrac, Amsoil, etc...