the 58/9 wipers and trans/arms are different than the 55.2-57 [vacuum as well as electric], AFAIK there are no modern replacement motors that are specific to 58/9 that had original electric wipers, but you should be able to find the vacuum arm parts via the parts wanted here, or maybe from a vendor like
Jim Carter who has a fair stock of used parts available, might give them a call
Bill
