You can almost bet your first born that the manufacturer is one and the same. There is not such a huge demand for most of these old truck parts that your going to have a large number of companies cutting each others throat trying to sell you their brand of widget. Here is an example of this. I recently needed a 12 v heater moor to replace the original 6 V. I shopped Chevys of 40, J.C. and Classic Parts, Each had a replacement motor with differing prices in the $40 to 60 range. ALL plus shipping and handling. I turned to my friend Google, did some searching and found a motor made by VDO,China,12V numbered VDO354 which sounded and looked like the parts offered by the vendors. Further study of the item from looking close up of the photo revealed the VDO 354 number at Chev of 40s.
Then going to my friend Amazon Prime and searching for 12V VDO 354 I found one selling for $30.85 free shipping,delivery guaranteed in 2 days. Guess which one I purchased? I have often said Google is your friend and I am now making Amazon Prime my next best friend.
Jerry


Jerry