The Hitachi TM-1081ZA or TM-1081ZB Seek & Scan AM radios came stock on the '70 and '71 model 240Zs. They have become quite expensive. I had a TM-1081ZA with all of the internals on the radio professionally refurbished that I sold on eBay for a best offer of $1,200.00 back in December. A lot of 240Z owners have installed the '72-'73 240Z Hitachi KM-1520CZ AM/FM radios in their '70 and '71 Zs, which are less than half of what the '70-'71 AM radios go for. It is commonly viewed as a period-correct upgrade since it also has FM and fits perfectly in the '70 and '71 240Zs. That's what I've decided to do with my two '71 240Zs.