I bought one of these and love it. The latching mechanism is similar to the system on zip ties and allows almost infinite adjustment. You can buy them on Amazon. I saw them on Shark Tank.

No Holes Belts as Seen on Shark Tank | Mission Belt Co

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13