2 More Join GOP Field in the 24th : Elections: The list of Republican candidates hoping to challenge Anthony C. Beilenson in the new congressional district now numbers 5.

A Van Nuys businessman and a Calabasas attorney have joined three other Republican candidates who hope to challenge Rep. Anthony C. Beilenson (D-Los Angeles) in a newly created congressional district that straddles the west San Fernando Valley and Ventura County.

Robert Colaco, who runs a private bookkeeping and payroll service in Van Nuys, said Monday that he will seek the GOP nomination to battle Beilenson in the new 24th District, which runs west from Sherman Oaks to Malibu and north to Thousand Oaks.

Meanwhile, Stephen M. Weiss, who specializes in personal injury, tax and business law, said he will also join the field of candidates seeking the Republican nomination in the June 2 primary.

Colaco and Weiss join three other Republicans in the race: Calabasas businessman Sang Korman, Reseda mortuary owner Jon Lorenzen and Beverly Hills international trade consultant Jim Salomon. Korman and Salomon have each lost two previous races for Congress.

But the GOP field could be dominated by Assemblyman Tom McClintock (R-Thousand Oaks), who has been considering whether to seek the congressional seat or a new state Senate seat in a district that covers the northwestern San Fernando Valley and southeastern Ventura County.

A prominent conservative, McClintock is a vocal critic of recent state tax increases backed by Gov. Pete Wilson. Based on his political stature and ability to raise campaign money, McClintock would be the favorite if he entered the GOP primary.

So far, Beilenson is the only candidate to announce his interest in the Democratic nomination to represent the district, created in a statewide shuffle of legislative territories by the state Supreme Court. He decided last month to enter the 24th District race, averting what could have been a bitter, expensive struggle with a longtime ally and friend, Rep. Henry A. Waxman (D-Los Angeles), in a district on Los Angeles’ Westside.

But Beilenson, a prominent liberal, faces a difficult reelection fight in the new district, an affluent swath of bedroom suburbs that contains considerably more Republican voters than his old Westside-West Valley district.

Colaco, 34, tried to run against Beilenson in 1990 but failed to file all his nomination papers on time. He heads a Van Nuys-based political group that tried unsuccessfully last year to recall Los Angeles Mayor Tom Bradley.

Saying the federal budget is “completely out of control,” Colaco promised to work to strengthen the Gramm-Rudman deficit-reduction act.

He declared that the promise of a “peace dividend is a hoax,” saying that although the Soviet Union has dissolved, the United States now faces “13 ex-Soviet republics armed, broke and dangerous, as well as dozens of potential nuclear threats from small dictatorial countries.”

Weiss, 44, a former Chicagoan, pledged “to bring basic Midwestern values and common sense” to Congress. He described himself as “unabashed supporter of the state of Israel.”

Weiss, who attended the University of West Los Angeles law school, said he has worked as executive director of the Cook County, Ill., Young Republicans and as a political consultant in Illinois and California.