N1: How to change drivers/cars within carsets?

I have Nascar 1, and I downloaded a 1998 carset from Simulator ***world. Looks good, but Dave Marcis is missing! What utilities do people use to manage their carsets, and how might I use one to subsitute drivers? Dave [link lost in import: /~dmoisan] Invisible Disability: [link lost in import: /~dmoisan/invisible_disability.html] GE Superradio FAQ: [link lost in import: /~dmoisan/faqs/superradio/gesr_faq.html]