There are many ways of finding manufacturers for your private label products. Although finding them is only the first step. After you’ve identified a potential manufacturer for your private label products, you’ll have to be able to contact them, conduct negotiation and maintain a positive business relationship.
Here’s a short guide on how to find Private Label Manufacturers:

1. On Google Search: 

• [Your industry] private label manufacturers
• [Your industry] private label supplier
• [Your industry] private labeler
• [Specific product] private label manufacturer 
• [Specific product] private label products

1. Search for manufacturers on Alibaba and Aliexpress. Here, you can search with the same technique as on Google. Note: Beware of scams, middle-men, and fraud.  
2. Find the right private label supplier on Reddit. Search for threads by people who are looking for relevant private label manufacturers or create a new one.
3. Seek to form business relationships during trade shows and conferences. Although it’ll be more difficult to find overseas manufacturers on local trade shows than online, a personally established relationship is often more likely to be based on substantial trust and appreciation for another, resulting in a better and longer-lasting business cooperation.