I got a swimsuit for V4..   wich it fits real well, looks great, however I have a body/head injection Lara pack that makes the original v4 body/head a little different .. but the swimsuit no longer fits correctly.. is there a way to make it fit that bodystyle? 

I understand something made for Aiko won't work correctly for Vicky unless ya convert it.. but what about what I  described above..

You've got a couple of possibilities.

1. Use magnets to push and pull the swimsuit in place. Takes a lot of fiddling, probably several hours. Costs: $0

2. Use a modeling application to change the swimsuit so that it fits perfectly. Takes a lot of fiddling too, several hours at least. Will get you a perfect fit if you keep at it long enough and persistently enough. Costs: $0 for a free modeler (Wings, Blender) to $15000 (Maya Unlimited, Houdini).

3. Buy a magnet set for V4. There's several at DAZ. I've used the Netherworks magnet set myself, it's pretty good. Main advantage: fast solution (minutes), results are pretty good, and the magnet set  can be used on all V4 clothes. Costs: around $10 per magnet set.

4. Buy Dimension3D's Morphing Clothes. It'll generate a matching morph in the swimsuit. Reputedly very good. Main advantage: usable on all figures, not only V4. Costs: $20.

5. Buy The Tailor at DAZ. Similar to Morphing Clothes. Can't recommend it though, the morphs it generates are of mediocre quality at best.

6. Buy Wardrobe Wizard by PhilC. More expensive than Morphing Clothes, but also more versatile - it can be used to convert that V4 swimsuit to Aiko 3, for example. With a little bit of trying results can be very good.

Look at what morphs are aapplied to the figure , and see if those same morphs can be applied to the swimsuit. If there is a custom body morph the suit does not have you will have to use whatever morphs are in the suit to get the best fit you can.

The other option is to try making the swimsuit a dynamic cloth and fit it in the cloth room

many thanks both of you very very much appreciated