muffler part # anyone know? donaldson or walker?

I need new mufflers my M100463's are rusted out but I'm not getting another pair of those. They're 51" long and really too long for my truck. I need the 30" shorty mufflers. Anyone know a part # for them with no baffles? Pittspower and 4statetrucks sell them but way overpriced @ $162-$175 each! They are 30" long with a 10" diameter and 5" inlet, 5" outlet and no baffles.

http://www.4statetrucks.com/exhaust/semi-truck-muffler-30in-shorty-performance-muffler_20386.asp

http://pittsburghpower.com/muffler/muffler-performance-shorty-30-stack

 

Yeah that's what I'll do call Monday and find out. I was hoping someone would know or had the mufflers and could look at the part number etched on them. I can't imagine paying much more than $80 or so for the shorties. The M100463 are a little under a $100 from Ryderfleet products but $200 at 4states and who knows how much at Pitts Power.

 

Donaldson doesn't have the dimensions I'm looking for according to their catalog. Walker doesn't either.

 

Dimensions?

 

Probably a standard full length 51" standing up behind your sleeper I'm assuming? My mufflers are horizontal underneath the cab. 51" is too long under there. It's what I have now but it's not what works best and I want to go back to a muffler that is shorter like the factory ones were.