Try this site .
www.pellandent.com
There should be drain holes in that grove , and they could be plugged up , allowing water to get to a depth where it can get over into the slide channel.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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