Vehicle came with beefy OEM Volvo Hitch 3529210, but no drawbar. The receiver on the hitch is approx 1 5/8" square, which is just over 41 mm, kind of an odd metric size. The only adapter (1 5/8" to 1 1/4") or 1 5/8" drawbar I can find to fit, are DSP brand (Canada), and they do not sell to U.S. The popular drawbars are of course 1 1/4", 2", and 2 1/2".
Anyone know where I can find an adapter or drawbar to fit this 1 5/8" receiver? Would rather not have to make something myself.

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1998 S70 T5, 5-speed manual, 225000 miles

Try etrailer.com. If it exists they will have it.
Otherwise you could weld some 3/16 shim to each side of a 1-1/4 draw bar.
Tom

You convinced me. Bought a Curt 45520 (1 1/4" bar, 3 1/8" rise) from JEGS for $15.67 delivered, and 3/16" x 1" x 3' bar stock from Lowe's for six and change. THANKS.
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1998 S70 T5, 5-speed manual, 225000 miles

Thank You very much for feedback.

You called it, etrailer does have a ton of selection, including 1-5/8" to 2" expander, but not a 1-5/8" to 1-1/4" reducer. I prefer the reducer (fits completely inside receiver) so as to not reduce the tongue weight capacity.

I grabbed some scraps of 3/16 bar stock, to do just as you suggested - essentially - I will weld to inside of receiver (welds at outer end only), instead of to drawbar. I figure the hitch will go with the car when I get rid of it at 350,000 miles - I will keep the standard drawbar to go on my next vehicle with standard receiver size. I admit it - I'm cheap.

Thanks again for suggestions - I like!

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1998 S70 T5, 5-speed manual, 225000 miles

Weld to the adapter, not your factory hitch. Theres a reason that hitch has an odd size, the Volvo factory hitches in europe are rated for roughly 5000 lbs instead of the 3500 that the american hitches sized for the vehicle and that the DOT says it can pull, this goes for older models as well. They sell frame stifners to up the load capacity even more on some models. but here in the US we are stuck with the wimpy stuff.
If you have to cheap out and not get the factory insert, just weld up slats on a cheap insert, but dont ruin that nice hitch :-)
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-------Robert,:'00 XC70. '95 960, '93 940t, '90 240 wagon, '94 940SE, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '92 Ford F350 diesel dually

You convinced me. Bought a Curt 45520 (1 1/4" bar, 3 1/8" rise) from JEGS for $15.67 delivered, and 3/16" x 1" x 3' bar stock from Lowe's for six and change. THANKS.
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1998 S70 T5, 5-speed manual, 225000 miles