Should be metric flange head bolts, or you could use a hex head bolt with a washer. Measurement should be M10-1.5 x 45 or 50mm long. Any fastenal, lowes, home depot, or most local hardware stores will have them in stock. Hope this helps let us all know.I was looking at the thread with the pictures and it is very helpful. But does anyone Know what size the 2 bolts for the proportioning valve are and can they be purchased?
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