Fuel Petcock - Non-Vacuum Replacement?

The vacuum fuel petcock on my 1979 KZ650 is leaking badly. I am not sure I want to waste money rebuilding it so was wondering if there's a non-vacuum replacement option? I've scoured eBay and Z1/Mikes XS sites but not finding anything with the 44mm mounting hole spacing. I also don't want to spend a ton of money on a Pingel setup unless that's the only option. Thoughts/ideas/leads welcome!

I believe some of the Yamaha non-vacum taps have the 44mm spacing, others will confirm (this is a uk company but I guess there must be USA suppliers if the shippings too much)

 

Why not add a brass in-line shutoff?
I bought a brand new vacuum petcock for my zrx AND added a shutoff. Filling up an engine with gas once was enough for me.
The vacuum shutoff comes in handy for when I forget to use the in-line shutoff, which is often.

Thanks for the suggestions all. I would prefer to just replace the petcock with a non-vacuum item and be done with it. If I do end up repairing or replacing the vacuum operated one I would definitely add in an-line shut-off.

Vacuum petcocks.  I think the 82-83 KZ50-CSR bolt hole spacing is 44mm and I think the 82-2005 police bikes are 44m as well. 
Kawasaki part numbers: 51023-1039. 51023-1375. I think the -1375 part supersedes the -1039.  (FYI: the 81 650-CSR is 34mm).

@Wookie58 that Mad Mopeds option looks like what I need. I'm just surprised it does not seem to be available from a US vendor. 

May be worth getting them to quote you for shipping

That looks a lot like the new petcock for the 78' KL 250. I'll have to go measure it since it's not installed.

 Nope, the KL 250 is also 34mm.

Who knew something like 44mm non-vac option would be so challenging! I recently bought replacement non-vac petcocks for my 77 XS650. The bolt centers on those are 42.5mm. So close but yet so far!