Those projectors in your link are designed for halogen bulbs. Putting the hids in them does not work very well.
If you want hids, Please buy real projectors. There are guys who will retrofit new lights for you..Maybe place an ad in the want to buy section......
Here's another idea.
I don't know for sure how much space you have in a 98 headlight. My 03 has about 105mm.
Here is a link to a neat hid projector set. They are 100mm so they should fit easily. They are designed to fit in the existing bulb hole. No drilling needed. One drawback is they use a somewhat unique bulb. I would buy a spare set of bulbs.
Once you bake the lights and remove the lenses, these should be real easy to install. Stick the projector in the bulb hole and tighten the nut. Since they are designed to fit the existing bulb opening, alignment should be good.
2 5'' G1 BI Xenon HID Headlight Projector Lens H1 H7 H4 H13 9005 9006 9004 9007 | eBay
I know some guys will disapprove of these since they have a unique bulb. But they are 100% better than hids in a halogen housing. They are also a pretty simple install. Some dude named Mike used these years ago..
Here's a link to his build.
Custom HID Projector Lens in an 01'+ Housing