Modchip for US V4

[Tang]

First let me thank all you guys for all the valuable information that I have found on your board. Keep it up.

Now to my Problem

I have a US Version 4 PS2 (not an V4 R), which currently has a no solder modchip installed. I am looking to change this out to a Magic 2, Messiah, or similar no-swap chip. I cannot find any no-swap chip that shows to be compatible with a US V4 PS2. Is there something I'm missing, or will I have to buy a newer PS2?

Thanks

Tang