Arnie,
I am not sure how you are trying to restore your 75 Z, but I had an idea with mine from this thread S30 Interior Clone examples
This guy put in a 240sx dash in his Z, and I thought it looked really clean. I thought about how the 240sx guys try and make their cars RHD by doing a front clip conversion, so I started looking around.
I found a RHD 240sx dash on ebay, it's pretty cheap, so if you are interested in something like that here is the eBay link.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=009&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=190124823746&rd=1
I don't think I am going to do it, I am going to restore the original dash myself.