Hi Kitty. My reply tacked to your post was more for the benefit of the OP and FYI to others as I figure you have navigated your way down the oil separator box path a number of times.

As for that short connector hose between the oil separator box and the flame trap -p/n 3501708, avail a number of places as genuine Volvo or aftermarket. If the flame trap is living between the intake runners then I think it needs to have that slight S-bend otherwise there may be too much tendency for the hose not to sit square on the nipples, hence your need to use nylon ties? -SS ring clamps would presumably also work. If you're wanting to raise the flame trap for easier access then a straight length of hose should work fine, like the blue striped one in the ipd relocation kit. As for finding bulk hose to use, all I can think of that might work is trying to find suitably sized heater hose that might be up to the task of living next to a hot engine block and being exposed to oil, but I'm not so sure it would last any longer than cheap aftermarket connector hoses. I've only had to replace one or two of those connector hoses over the years and managed to have spares that came with flame trap kits that I'd purchased as I went through a period of perpetually breaking the small brittle hose nipples off the top of the flame trap until I learned to be extra careful. The aftermarket hose connectors may not be as good as genuine Volvo, but seem to last reasonably well in my experience, but then I keep my engine compartment clean so there is less oil nd dirt on hoses and wiring.

Thinking of flame traps, I can remember the original style spiral copper flame trap elements. I still occasionally see those in the aftermarket. A horrid design, perpetually plugging as engines got older. Those were in the B20/B21/B23 days when you could do the oil filler cap suck down test to see if they were plugged. Thankfully they realized that a bunch of 3/16" (or whatever) holes in a solid element was a suitable flame arrestor. FYI to others, inter-cooled turbos do not need a flame arrestor -a straight through flame trap housing is used, but a regular one can be used with the element removed.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now