Hi everyone, just curious as to the difference between the 17904-59R pushrods and the standard street-going bikes? Were the pre-1960 street pushrods steel or something like that? Did street bikes from 1960 or so onwards start to use the aluminium pushrods, obsoleting the -59R part number?
I have a set of the -59R pushrods (and see a set that have been on ebay for ages) that I'll use on my 61 XLR project, but the set of 1961 pushrods and aluminium covers I just bought look identical - not that I have them in front of me yet to directly compare.