Need rear sight elevator for Marlin "Western Field" 336 (740a-emn)

[MIL-DOT]

I just picked up a near mint Marlin 30-30 ( a '71 I believe) that's missing the rear sight elevator. I'm doing some internet searching and seeing a wide range of prices, and I'm concerned about compatibility. I would assume the Western Field 740 would use the identical ramp as the regular 336's ( I saw one E-bay ad that said his ramp fit "most Marlin's, Sears, and Glenfield models", but Western Field was conspicuously absent, so I thought I should check first.)
Also, if anyone can point me towrds the cheapest source for one of these, I'd appreciate it.

 

[Coop45]

Try Numrich Arms.

 

[MIL-DOT]

Thanks, I already saw theirs, but I was hoping to do better than $15 plus shipping, but I'll take another look.
MidwayUSA has one for $4.99. but some reviewers have said this unit was too wide for the slot in the sight-leaf in their older rifles.
http://www.midwayusa.com/product/76...models-1894ss-39a-922-magnum-model-9-model-45