Yes, there is a version of the Sealcon CD63M2-BK cable gland that has smaller holes. The CD63M1-BK has 10mm holes rather than 12mm, and there are 8 holes rather than 6. If 10mm is still too large, there is the CD63MP-BK, which has a solid insert so custom holes can be drilled into it by the user.
CD63M2-BK black nylon strain relief has M63 x 1.5 Metric Thread, with a 6 hole, .47' (12 mm) insert. Sold Individually. Also known as Hummel # 1.597.6301.51
CD63M2-BK black nylon strain relief has M63 x 1.5 Metric Thread, with a 6 hole, .47' (12 mm) insert. Sold Individually. Also known as Hummel # 1.597.6301.51