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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.I have enclosed a source in the link below for may have or can find you a blower motor resistor for your 1975 Grandville . Give them a call and see if thye can get you one.Copy and paste the link to your browser to open and view it.http://www.oldsobsolete.com/products-page/1971-buick-parts-for-sale/1971-74-gm-blower-motor-resistor-nos-3998401/