Just wondering if any one knows the actual diameter of the back plate that mounts to the firewall, and the inside width of the two arms when extended fully?
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I'm using smallest size for a .46 engine. Reinforced plastic quality is very good. Easy centering and deepening. Require 3,5-4mm diameter bolts and nuts for attaching to firewall and for engine. Not self tapping screws. Specifications for this smallest size: Diameter- 63mm, lenght- 82mm. Firewall bolt pattern- 25x46mm. Mounting width- min 26mm, max 51mm. (Adjustable centering.) Beam width- 9,5mm. Distance, firewall to engine back plate bolts- min 23mm. max 31mm. (Adjustable deepening.)