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81-254 Patio Roller Assembly, 1-1/2" Nylon Concave BB

I need to replace one sliding door roller guide.2 1/2" long, 3/4" wide, 1 1/16 high, 1" diameter metal wheel. Has a wheel adjustment screw. It is stamped "DEL MAR ENG. LONG BEACH,CAL." PAT. 3,670,357. This a double thermal glass aluminum frame door 4' x 6' 8". Very heavy probably manufactured i ... (cont.)