A couple things: sales leadership and company culture are very closely linked. The sales management style at an AT&T kiosk is much different than the sales management style at an enterprise software startup. Try to find someone not necessarily in the same space, but in a company that closely aligns with your company's culture.
Next, find someone with a proven track record of leadership. There's a big difference between a manager and a leader. You don't need to hire them, just take them out for coffee (or, hell, find them on Clarity :)). But they have to be a good leader. See if you can talk to their direct reports, or surreptitiously ask your friends/network if they have a manager they look up to.
Ultimately, management is about people, so the industry really doesn't matter. A good sales leader can inspire the team without having to know the ins and outs of the industry or product.
Mentor for your sales leadership, or for that matter any kind of leadership must be a person who provides you with the tools, guidance, support, and feedback you need to thrive in your career. If you do not find these qualities inside a person, he is not a mentor you are looking for.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath