273 dipstick tube length...Dads is...BROKEN!!

So when dad took the engine in to the machine shop to get the cam bearings installed they ended up breaking the dipstick tube for engine oil......ahhh frustrations dont end there, the guy threw the bottom piece out!! So we have the dipstick and the top part of the tube....does anyone know the proper length on the tube?? That way we can adapt one....

Thanks
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