It appears that the o.e. WEHRLE 54 201 102 FOUR prong flasher is not available through all the sources that I tried. Is there a alternative in a Buss or Tridon, etc... 4-prong flasher unit that I'm not aware of ??
Thanks, Duck

Looks like Pelican has them for you. Using your p/n they list the Wehrle OEM as aftermarket, but out of stock. They list the Genuine Porsche version at double the cost, 8 currently in stock. The link is below the ADD TO CART

Looking closely at the image there's a Porsche 914 part no on the case. Search globally for variations of that p/n and you may find cheaper options. I quickly found one on 5150Motorsport under Wehrle p/n 914-618-303-12. It pays to be creative and search for every number you can find and especially to go searching for it when you find it's also used on other cars, like the 1969-1984 Porsche 900 series here
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now

Hi Duck,

CEC big lamp manufacturer also makes flashers.
You can go here:
https://ceclighting.com/products/flashers.php
If you find the CEC part nr. Search at Ebay with it.
There's CEC distributors there.

Dave Barton might have them: www.davebarton.com

Bill

Bill, I did see that CEC L26 looks like it would work.
Flea-bay , here I come.