A "guide+stop" is not the same thing as an "anchor".
An "anchor" restrains the specified node point against movement in all six degrees of freedom.
A "guide" is a horizontal translational restraint perpendicular to the pipe axis. So this restrains movement in a single degree of freedom (assuming the pipe is in "X" or "Z").
A "stop" is a horizontal translational restraint aligned axially with the pipe. So this restrains movement in a single degree of freedom.
If you can't use an anchor, you need to restrain the appropriate DOFs individually.
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Regards,
Richard Ay - Consultant