Can't help ya, on those 'highish' numbered 2xxxxxx - series parts, but as a general rule, 1xxxxxx - series parts date to the 50's & 2xxxxxx - series parts relate to the 60's, & 3xxxxxx - series parts pertain to the 70's. 1957-58 parts include 16xxxxx but most often 17xxxxx & 18xxxxx -series parts, with the second number confirming the 'date' of the first-issuance of the subject part, even tho that part might be continued to be used, on later-model applications. This ain't "news" to most of us, maybe, but it probably IS, to some of us. Neil Vedder |