AHA8 scsi

We want to use a newer SCSI card with version 4.24 and I saw that the newer
card are supported with the aha8 driver. Our problem is that that driver is
not included with 4.24 and I can not find a download for it anywhere and I
also dont know how to install it when I do get it downloaded. Where can I
find this driver and how do I install it?
Thanks in advance