Walk into the parts department & buy it. Or mailorder it from your favorite place like manhonda.com or hondaautomotiveparts.com

Honda didn't come out with MTF until '96 or '97. The owner's manual for my '95 GS-R says motor oil. But MTF worked better for me.

But more important - it sounds like the synchro is just working properly. Try double-clutching to shift into 1st at a little faster road speed. Or don't. Why do you want to do that anyway?