We can provide information (dimensions, fasteners, allowable loads, etc.) and show the applications the products are designed for, but it would be up to the Designer to specify the connectors (which product, how many) for the specific project. I can tell you the installation described is not how these angles were designed/tested. We do not have any products evaluated for the installation into the end of stumps. Thank you!
The hole diameters in the APVA4 are 0.563"; they require the Outdoor Accents® SDWS22312DBB structural wood screws inserted through STN22 washers. Fasteners sold separately. Thank you!
The APVA4 is typically installed in pairs as shown in the installed pictures here. For this application the allowable loads are uplift (160) capacity 710 lbs. and F1 (160) capacity 1,220 lbs. These loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern. For single part installations, use half of the loads above. Thank you!