I cant confirm or deny, but if the 5/8" doesn't give you enough, a layer or two of weatherstripping could only help matters. Personally, I use it under all my speaker flanges. It helps create a good seal, and helps with vibration issues. 1/8" is not much to make up. a single layer under your spacer, and under your speaker flange may be just the ticket.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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