April 17, 2015 Online Store No Comments +3 Plate for Bolt On Shock Mount 10305 C$5.00 In stock Quantity: 1 Add to Bag Product Details Brand: Welder Series MPN: 10305 Thickness: 3/16" Hole size: 5/16" 3-½" x 2-3/8" with 4 holes 5/16" diameter. Designed to turn #1030 into a bolt-on mount. Save this product for later Favorite