I believe they are for the shock absorbers. I haven't installed mine, they're still in the box, but I have done the rest of the front end and the rear radius arms and one thing is certain: If your workshop got the front and rear radius-arm-to-chassis bushes mixed up you would certainly have a problem. The rear bushings have a steel insert, the fronts don't. And more likely than not, the wrong busing would end up too loose and they probably wouldn't center the radius arm in the chassis hole either. The front and rear bushings are very different. Sort this out and you're probably home free.
regards,
Henrik