GTV turn signal relay

[Alfisto@domain.elided]

Does anyone know if there is any aftermarket turn signal relay with four 
prongs which fit the 74 GTV and spider, so I do not have to buy the $110 
Bosch unit ? Can the regular three prong round flasher unit be adapted to 
work - even without the four way emergency flashing capability ?
Graham Arlen
61 spider, 74 GTV, 87 Milano, 94 164 

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