Early A LCA struts

a few questions for you on the early A (63-66) LCA struts:

1) are the correct OEM bushings the 1 piece per side, push in and squeeze type? or the later A, two piece hockey puck looking bushings?
2) CAN you go with the later A bushings, and if so, wouldn't that tighten things up considerably over the 1 piece?
3) What is the length difference in the LCA strut, early A, to later A (OEM)

thanks