The versions designed for 4 will work in 5. I might suggest mass compiling the driver before you use it. Are the T and A models similar enough to be adapted? If not, you can submit a request for this driver at:
http://zone.ni.com/idnet/other.htm
We develop drivers based on demand and popularity so the more requests we have for it, the greater the possibility that we will develop one.
If you would like to try developing your own instrument driver (or modify the existing one), we have documentation, model instrument drivers, and driver templates to help at :
http://zone.ni.com/idnet/development.htm
We also have a syndicate of third party vendors that specialize in National Instruments' products and services. Some of the vendors specialize in driver development.
I would suggest contacting one of the Alliance members at:
http://www.ni.com/alliance
Ryan Mosley
National Instruments, Applications Engineer
http://www.ni.com/exchange