Good morning - have the oil filter hole cut and plan to knock out (so to speak) the filler and smaller lines.

Have the sizes for the rest;

4" to 4.5" for the oil filter (done)
2" for the breather hoses
2.5" for the filler neck
1.5" for the 2 hole return line holes.

I'm not staring at the car or @mb911 tank right now but the oil tanks have two mounting bolts that also need to be drilled? I suppose I can just match the thread size to the drill bit but does anyone have that sizing handy?

Thanks!

5/16" is equal to 8mm (the bolt size) but would suggest a 3/8" as you will need wiggle room for sure. Also lay out the return very well with the tank or that can be a bugger.

Thanks Ben!

All done except for the last oil line - the bottom one towards the firewall looks like a bugger to properly locate.

Yes it is

I’m thinking to measure the dimensions from the oil filter opening to the wind on your tank and then replicate that on the car. Is there a better way?

I tried to make a stencil and then duplicate on the interior panel but found it awkward so to double check I used grade 4 math...Triangulate. On the the tank I measured from the left mount to center of the return port-string line and scribed and arc on the panel. Measured from second right mount to center of return port - String line and scribed an arc. Where they intersected was center.

My stencil was out 1/2".

Very helpful, thank you for the post.

You can always drill the hole a little larger and use a fender washer.

Thanks, will likely do that.

Can I use a giant fender washer if I screw up the oil line holes? Ha!

Thanks for the response.