There is a bit of stink about retro fit ones at mo as said to be illegal.
My dad has 4 litre V8 xr4i with same lights and I put 130/90 H4 bulbs in them with relays 130 w inners made world of difference, well worth doing, what I have in my sapphy cos.
tabetha
ps please post how well they work when you get done, would be very much appreciated.