Dovetail Plate with 3/4" Wide Dovetail?

I'm looking for a dovetail plate that looks like this:

Top view:
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| |
| oooooo |
| |
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The circles represent a slot.
Length would be 6-8" and width 2-3"

Side view:
+
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| |
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|
|
HHH
|
-
H is a weight and + screw head. I have the weight and screw rod.

End view:

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| |
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\ /
\ / - Dovetail
_

The plate and dovetail need to be 1/4" thick. Any ideas where I can get
something like this. Of course, Losmandy is a choice. I'll call them again
Monday.

Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

"He who laughs, lasts." -- Mary Pettibone Poole
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