There's no need for large diameter lines to the bypass oil filter. There should be an orifice fitting at the supply point from the oil gallery that restricts flow to the filter. You'd only need large diameter lines for a high flow filter which is not what a bypass filter is.
A hydraulic shop could fab up some lines for you that should last for a long time as long as they aren't rubbing against something.
Maybe you need to confirm that your filter supply fitting has the orifice to restrict flow to the filter, which essentially drops the pressure at the hoses and the filter to just above crankcase pressure.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.